21507771

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1\times {\mathrm{109}}^1$

素因数の和:255

約数の個数: 32

約数和(自身を含む): 31648320

約数和(自身を除く): 10140549

約数列:

[1, 3, 17, 51, 53, 73, 109, 159, 219, 327, 901, 1241, 1853, 2703, 3723, 3869, 5559, 5777, 7957, 11607, 17331, 23871, 65773, 98209, 135269, 197319, 294627, 405807, 421721, 1265163, 7169257, 21507771]

約数ペア:

[(1, 21507771), (3, 7169257), (17, 1265163), (51, 421721), (53, 405807), (73, 294627), (109, 197319), (159, 135269), (219, 98209), (327, 65773), (901, 23871), (1241, 17331), (1853, 11607), (2703, 7957), (3723, 5777), (3869, 5559)]