20818791

素因数分解:

$3^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 35942400

約数和(自身を除く): 15123609

約数列:

[1, 3, 7, 9, 21, 47, 63, 79, 89, 141, 237, 267, 329, 423, 553, 623, 711, 801, 987, 1659, 1869, 2961, 3713, 4183, 4977, 5607, 7031, 11139, 12549, 21093, 25991, 29281, 33417, 37647, 49217, 63279, 77973, 87843, 147651, 233919, 263529, 330457, 442953, 991371, 2313199, 2974113, 6939597, 20818791]

約数ペア:

[(1, 20818791), (3, 6939597), (7, 2974113), (9, 2313199), (21, 991371), (47, 442953), (63, 330457), (79, 263529), (89, 233919), (141, 147651), (237, 87843), (267, 77973), (329, 63279), (423, 49217), (553, 37647), (623, 33417), (711, 29281), (801, 25991), (987, 21093), (1659, 12549), (1869, 11139), (2961, 7031), (3713, 5607), (4183, 4977)]