21972981

素因数分解:

$3^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:273

約数の個数: 32

約数和(自身を含む): 32256000

約数和(自身を除く): 10283019

約数列:

[1, 3, 23, 29, 69, 79, 87, 139, 237, 417, 667, 1817, 2001, 2291, 3197, 4031, 5451, 6873, 9591, 10981, 12093, 32943, 52693, 92713, 158079, 252563, 278139, 318449, 757689, 955347, 7324327, 21972981]

約数ペア:

[(1, 21972981), (3, 7324327), (23, 955347), (29, 757689), (69, 318449), (79, 278139), (87, 252563), (139, 158079), (237, 92713), (417, 52693), (667, 32943), (1817, 12093), (2001, 10981), (2291, 9591), (3197, 6873), (4031, 5451)]