20821240

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{599}}^1$

素因数の和:700

約数の個数: 64

約数和(自身を含む): 51840000

約数和(自身を除く): 31018760

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 79, 88, 110, 158, 220, 316, 395, 440, 599, 632, 790, 869, 1198, 1580, 1738, 2396, 2995, 3160, 3476, 4345, 4792, 5990, 6589, 6952, 8690, 11980, 13178, 17380, 23960, 26356, 32945, 34760, 47321, 52712, 65890, 94642, 131780, 189284, 236605, 263560, 378568, 473210, 520531, 946420, 1041062, 1892840, 2082124, 2602655, 4164248, 5205310, 10410620, 20821240]

約数ペア:

[(1, 20821240), (2, 10410620), (4, 5205310), (5, 4164248), (8, 2602655), (10, 2082124), (11, 1892840), (20, 1041062), (22, 946420), (40, 520531), (44, 473210), (55, 378568), (79, 263560), (88, 236605), (110, 189284), (158, 131780), (220, 94642), (316, 65890), (395, 52712), (440, 47321), (599, 34760), (632, 32945), (790, 26356), (869, 23960), (1198, 17380), (1580, 13178), (1738, 11980), (2396, 8690), (2995, 6952), (3160, 6589), (3476, 5990), (4345, 4792)]