21203679

素因数分解:

$3^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{12781}}^1$

素因数の和:12870

約数の個数: 16

約数和(自身を含む): 32721920

約数和(自身を除く): 11518241

約数列:

[1, 3, 7, 21, 79, 237, 553, 1659, 12781, 38343, 89467, 268401, 1009699, 3029097, 7067893, 21203679]

約数ペア:

[(1, 21203679), (3, 7067893), (7, 3029097), (21, 1009699), (79, 268401), (237, 89467), (553, 38343), (1659, 12781)]