20891997

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19507}}^1$

素因数の和:19537

約数の個数: 24

約数和(自身を含む): 36518976

約数和(自身を除く): 15626979

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071, 19507, 58521, 136549, 175563, 331619, 409647, 994857, 1228941, 2321333, 2984571, 6963999, 20891997]

約数ペア:

[(1, 20891997), (3, 6963999), (7, 2984571), (9, 2321333), (17, 1228941), (21, 994857), (51, 409647), (63, 331619), (119, 175563), (153, 136549), (357, 58521), (1071, 19507)]