21957369

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{487}}^1$

素因数の和:629

約数の個数: 32

約数和(自身を含む): 35604480

約数和(自身を除く): 13647111

約数列:

[1, 3, 7, 19, 21, 57, 113, 133, 339, 399, 487, 791, 1461, 2147, 2373, 3409, 6441, 9253, 10227, 15029, 27759, 45087, 55031, 64771, 165093, 194313, 385217, 1045589, 1155651, 3136767, 7319123, 21957369]

約数ペア:

[(1, 21957369), (3, 7319123), (7, 3136767), (19, 1155651), (21, 1045589), (57, 385217), (113, 194313), (133, 165093), (339, 64771), (399, 55031), (487, 45087), (791, 27759), (1461, 15029), (2147, 10227), (2373, 9253), (3409, 6441)]