21281968

素因数分解:

$2^4\times {\mathrm{79}}^1\times {\mathrm{113}}^1\times {\mathrm{149}}^1$

素因数の和:349

約数の個数: 40

約数和(自身を含む): 42408000

約数和(自身を除く): 21126032

約数列:

[1, 2, 4, 8, 16, 79, 113, 149, 158, 226, 298, 316, 452, 596, 632, 904, 1192, 1264, 1808, 2384, 8927, 11771, 16837, 17854, 23542, 33674, 35708, 47084, 67348, 71416, 94168, 134696, 142832, 188336, 269392, 1330123, 2660246, 5320492, 10640984, 21281968]

約数ペア:

[(1, 21281968), (2, 10640984), (4, 5320492), (8, 2660246), (16, 1330123), (79, 269392), (113, 188336), (149, 142832), (158, 134696), (226, 94168), (298, 71416), (316, 67348), (452, 47084), (596, 35708), (632, 33674), (904, 23542), (1192, 17854), (1264, 16837), (1808, 11771), (2384, 8927)]