21790540

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{8317}}^1$

素因数の和:8457

約数の個数: 24

約数和(自身を含む): 46114992

約数和(自身を除く): 24324452

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 8317, 16634, 33268, 41585, 83170, 166340, 1089527, 2179054, 4358108, 5447635, 10895270, 21790540]

約数ペア:

[(1, 21790540), (2, 10895270), (4, 5447635), (5, 4358108), (10, 2179054), (20, 1089527), (131, 166340), (262, 83170), (524, 41585), (655, 33268), (1310, 16634), (2620, 8317)]