20891618

素因数分解:

$2^1\times {\mathrm{11}}^2\times {\mathrm{131}}^1\times {\mathrm{659}}^1$

素因数の和:814

約数の個数: 24

約数和(自身を含む): 34760880

約数和(自身を除く): 13869262

約数列:

[1, 2, 11, 22, 121, 131, 242, 262, 659, 1318, 1441, 2882, 7249, 14498, 15851, 31702, 79739, 86329, 159478, 172658, 949619, 1899238, 10445809, 20891618]

約数ペア:

[(1, 20891618), (2, 10445809), (11, 1899238), (22, 949619), (121, 172658), (131, 159478), (242, 86329), (262, 79739), (659, 31702), (1318, 15851), (1441, 14498), (2882, 7249)]