20999713

素因数分解:

$7^1\times {\mathrm{23}}^2\times {\mathrm{53}}^1\times {\mathrm{107}}^1$

素因数の和:213

約数の個数: 24

約数和(自身を含む): 25800768

約数和(自身を除く): 4801055

約数列:

[1, 7, 23, 53, 107, 161, 371, 529, 749, 1219, 2461, 3703, 5671, 8533, 17227, 28037, 39697, 56603, 130433, 196259, 396221, 913031, 2999959, 20999713]

約数ペア:

[(1, 20999713), (7, 2999959), (23, 913031), (53, 396221), (107, 196259), (161, 130433), (371, 56603), (529, 39697), (749, 28037), (1219, 17227), (2461, 8533), (3703, 5671)]