21298160

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20479}}^1$

素因数の和:20505

約数の個数: 40

約数和(自身を含む): 53329920

約数和(自身を除く): 32031760

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20479, 40958, 81916, 102395, 163832, 204790, 266227, 327664, 409580, 532454, 819160, 1064908, 1331135, 1638320, 2129816, 2662270, 4259632, 5324540, 10649080, 21298160]

約数ペア:

[(1, 21298160), (2, 10649080), (4, 5324540), (5, 4259632), (8, 2662270), (10, 2129816), (13, 1638320), (16, 1331135), (20, 1064908), (26, 819160), (40, 532454), (52, 409580), (65, 327664), (80, 266227), (104, 204790), (130, 163832), (208, 102395), (260, 81916), (520, 40958), (1040, 20479)]