21397521

素因数分解:

$3^1\times {\mathrm{23}}^2\times {\mathrm{97}}^1\times {\mathrm{139}}^1$

素因数の和:285

約数の個数: 24

約数和(自身を含む): 30348640

約数和(自身を除く): 8951119

約数列:

[1, 3, 23, 69, 97, 139, 291, 417, 529, 1587, 2231, 3197, 6693, 9591, 13483, 40449, 51313, 73531, 153939, 220593, 310109, 930327, 7132507, 21397521]

約数ペア:

[(1, 21397521), (3, 7132507), (23, 930327), (69, 310109), (97, 220593), (139, 153939), (291, 73531), (417, 51313), (529, 40449), (1587, 13483), (2231, 9591), (3197, 6693)]