128721920

素因数分解:

$2^{10}\times 5^1\times {\mathrm{31}}^1\times {\mathrm{811}}^1$

素因数の和:867

約数の個数: 88

約数和(自身を含む): 319135488

約数和(自身を除く): 190413568

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 512, 620, 640, 811, 992, 1024, 1240, 1280, 1622, 1984, 2480, 2560, 3244, 3968, 4055, 4960, 5120, 6488, 7936, 8110, 9920, 12976, 15872, 16220, 19840, 25141, 25952, 31744, 32440, 39680, 50282, 51904, 64880, 79360, 100564, 103808, 125705, 129760, 158720, 201128, 207616, 251410, 259520, 402256, 415232, 502820, 519040, 804512, 830464, 1005640, 1038080, 1609024, 2011280, 2076160, 3218048, 4022560, 4152320, 6436096, 8045120, 12872192, 16090240, 25744384, 32180480, 64360960, 128721920]

約数ペア:

[(1, 128721920), (2, 64360960), (4, 32180480), (5, 25744384), (8, 16090240), (10, 12872192), (16, 8045120), (20, 6436096), (31, 4152320), (32, 4022560), (40, 3218048), (62, 2076160), (64, 2011280), (80, 1609024), (124, 1038080), (128, 1005640), (155, 830464), (160, 804512), (248, 519040), (256, 502820), (310, 415232), (320, 402256), (496, 259520), (512, 251410), (620, 207616), (640, 201128), (811, 158720), (992, 129760), (1024, 125705), (1240, 103808), (1280, 100564), (1622, 79360), (1984, 64880), (2480, 51904), (2560, 50282), (3244, 39680), (3968, 32440), (4055, 31744), (4960, 25952), (5120, 25141), (6488, 19840), (7936, 16220), (8110, 15872), (9920, 12976)]