21990170

素因数分解:

$2^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{5653}}^1$

素因数の和:6049

約数の個数: 16

約数和(自身を含む): 39691080

約数和(自身を除く): 17700910

約数列:

[1, 2, 5, 10, 389, 778, 1945, 3890, 5653, 11306, 28265, 56530, 2199017, 4398034, 10995085, 21990170]

約数ペア:

[(1, 21990170), (2, 10995085), (5, 4398034), (10, 2199017), (389, 56530), (778, 28265), (1945, 11306), (3890, 5653)]