21903515

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1\times {\mathrm{563}}^1$

素因数の和:850

約数の個数: 16

約数和(自身を含む): 27288576

約数和(自身を除く): 5385061

約数列:

[1, 5, 31, 155, 251, 563, 1255, 2815, 7781, 17453, 38905, 87265, 141313, 706565, 4380703, 21903515]

約数ペア:

[(1, 21903515), (5, 4380703), (31, 706565), (155, 141313), (251, 87265), (563, 38905), (1255, 17453), (2815, 7781)]