20778160

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19979}}^1$

素因数の和:20005

約数の個数: 40

約数和(自身を含む): 52027920

約数和(自身を除く): 31249760

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19979, 39958, 79916, 99895, 159832, 199790, 259727, 319664, 399580, 519454, 799160, 1038908, 1298635, 1598320, 2077816, 2597270, 4155632, 5194540, 10389080, 20778160]

約数ペア:

[(1, 20778160), (2, 10389080), (4, 5194540), (5, 4155632), (8, 2597270), (10, 2077816), (13, 1598320), (16, 1298635), (20, 1038908), (26, 799160), (40, 519454), (52, 399580), (65, 319664), (80, 259727), (104, 199790), (130, 159832), (208, 99895), (260, 79916), (520, 39958), (1040, 19979)]