21781516

素因数分解:

$2^2\times {\mathrm{53}}^1\times {\mathrm{127}}^1\times {\mathrm{809}}^1$

素因数の和:993

約数の個数: 24

約数和(自身を含む): 39191040

約数和(自身を除く): 17409524

約数列:

[1, 2, 4, 53, 106, 127, 212, 254, 508, 809, 1618, 3236, 6731, 13462, 26924, 42877, 85754, 102743, 171508, 205486, 410972, 5445379, 10890758, 21781516]

約数ペア:

[(1, 21781516), (2, 10890758), (4, 5445379), (53, 410972), (106, 205486), (127, 171508), (212, 102743), (254, 85754), (508, 42877), (809, 26924), (1618, 13462), (3236, 6731)]