649435120

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1\times {\mathrm{1999}}^1$

素因数の和:2174

約数の個数: 80

約数和(自身を含む): 1571328000

約数和(自身を除く): 921892880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 131, 155, 248, 262, 310, 496, 524, 620, 655, 1048, 1240, 1310, 1999, 2096, 2480, 2620, 3998, 4061, 5240, 7996, 8122, 9995, 10480, 15992, 16244, 19990, 20305, 31984, 32488, 39980, 40610, 61969, 64976, 79960, 81220, 123938, 159920, 162440, 247876, 261869, 309845, 324880, 495752, 523738, 619690, 991504, 1047476, 1239380, 1309345, 2094952, 2478760, 2618690, 4189904, 4957520, 5237380, 8117939, 10474760, 16235878, 20949520, 32471756, 40589695, 64943512, 81179390, 129887024, 162358780, 324717560, 649435120]

約数ペア:

[(1, 649435120), (2, 324717560), (4, 162358780), (5, 129887024), (8, 81179390), (10, 64943512), (16, 40589695), (20, 32471756), (31, 20949520), (40, 16235878), (62, 10474760), (80, 8117939), (124, 5237380), (131, 4957520), (155, 4189904), (248, 2618690), (262, 2478760), (310, 2094952), (496, 1309345), (524, 1239380), (620, 1047476), (655, 991504), (1048, 619690), (1240, 523738), (1310, 495752), (1999, 324880), (2096, 309845), (2480, 261869), (2620, 247876), (3998, 162440), (4061, 159920), (5240, 123938), (7996, 81220), (8122, 79960), (9995, 64976), (10480, 61969), (15992, 40610), (16244, 39980), (19990, 32488), (20305, 31984)]