21357505

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{6991}}^1$

素因数の和:7056

約数の個数: 16

約数和(自身を含む): 28191744

約数和(自身を除く): 6834239

約数列:

[1, 5, 13, 47, 65, 235, 611, 3055, 6991, 34955, 90883, 328577, 454415, 1642885, 4271501, 21357505]

約数ペア:

[(1, 21357505), (5, 4271501), (13, 1642885), (47, 454415), (65, 328577), (235, 90883), (611, 34955), (3055, 6991)]