644561920

素因数分解:

$2^{10}\times 5^1\times {\mathrm{31}}^2\times {\mathrm{131}}^1$

素因数の和:218

約数の個数: 132

約数和(自身を含む): 1609875432

約数和(自身を除く): 965313512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 131, 155, 160, 248, 256, 262, 310, 320, 496, 512, 524, 620, 640, 655, 961, 992, 1024, 1048, 1240, 1280, 1310, 1922, 1984, 2096, 2480, 2560, 2620, 3844, 3968, 4061, 4192, 4805, 4960, 5120, 5240, 7688, 7936, 8122, 8384, 9610, 9920, 10480, 15376, 15872, 16244, 16768, 19220, 19840, 20305, 20960, 30752, 31744, 32488, 33536, 38440, 39680, 40610, 41920, 61504, 64976, 67072, 76880, 79360, 81220, 83840, 123008, 125891, 129952, 134144, 153760, 158720, 162440, 167680, 246016, 251782, 259904, 307520, 324880, 335360, 492032, 503564, 519808, 615040, 629455, 649760, 670720, 984064, 1007128, 1039616, 1230080, 1258910, 1299520, 2014256, 2079232, 2460160, 2517820, 2599040, 4028512, 4158464, 4920320, 5035640, 5198080, 8057024, 10071280, 10396160, 16114048, 20142560, 20792320, 32228096, 40285120, 64456192, 80570240, 128912384, 161140480, 322280960, 644561920]

約数ペア:

[(1, 644561920), (2, 322280960), (4, 161140480), (5, 128912384), (8, 80570240), (10, 64456192), (16, 40285120), (20, 32228096), (31, 20792320), (32, 20142560), (40, 16114048), (62, 10396160), (64, 10071280), (80, 8057024), (124, 5198080), (128, 5035640), (131, 4920320), (155, 4158464), (160, 4028512), (248, 2599040), (256, 2517820), (262, 2460160), (310, 2079232), (320, 2014256), (496, 1299520), (512, 1258910), (524, 1230080), (620, 1039616), (640, 1007128), (655, 984064), (961, 670720), (992, 649760), (1024, 629455), (1048, 615040), (1240, 519808), (1280, 503564), (1310, 492032), (1922, 335360), (1984, 324880), (2096, 307520), (2480, 259904), (2560, 251782), (2620, 246016), (3844, 167680), (3968, 162440), (4061, 158720), (4192, 153760), (4805, 134144), (4960, 129952), (5120, 125891), (5240, 123008), (7688, 83840), (7936, 81220), (8122, 79360), (8384, 76880), (9610, 67072), (9920, 64976), (10480, 61504), (15376, 41920), (15872, 40610), (16244, 39680), (16768, 38440), (19220, 33536), (19840, 32488), (20305, 31744), (20960, 30752)]