21105561

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{109}}^1$

素因数の和:253

約数の個数: 32

約数和(自身を含む): 30976000

約数和(自身を除く): 9870439

約数列:

[1, 3, 19, 43, 57, 79, 109, 129, 237, 327, 817, 1501, 2071, 2451, 3397, 4503, 4687, 6213, 8611, 10191, 14061, 25833, 64543, 89053, 163609, 193629, 267159, 370273, 490827, 1110819, 7035187, 21105561]

約数ペア:

[(1, 21105561), (3, 7035187), (19, 1110819), (43, 490827), (57, 370273), (79, 267159), (109, 193629), (129, 163609), (237, 89053), (327, 64543), (817, 25833), (1501, 14061), (2071, 10191), (2451, 8611), (3397, 6213), (4503, 4687)]