21001360

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3323}}^1$

素因数の和:3415

約数の個数: 40

約数和(自身を含む): 49461120

約数和(自身を除く): 28459760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3323, 6320, 6646, 13292, 16615, 26584, 33230, 53168, 66460, 132920, 262517, 265840, 525034, 1050068, 1312585, 2100136, 2625170, 4200272, 5250340, 10500680, 21001360]

約数ペア:

[(1, 21001360), (2, 10500680), (4, 5250340), (5, 4200272), (8, 2625170), (10, 2100136), (16, 1312585), (20, 1050068), (40, 525034), (79, 265840), (80, 262517), (158, 132920), (316, 66460), (395, 53168), (632, 33230), (790, 26584), (1264, 16615), (1580, 13292), (3160, 6646), (3323, 6320)]