20781328

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{149}}^1\times {\mathrm{379}}^1$

素因数の和:559

約数の個数: 40

約数和(自身を含む): 42408000

約数和(自身を除く): 21626672

約数列:

[1, 2, 4, 8, 16, 23, 46, 92, 149, 184, 298, 368, 379, 596, 758, 1192, 1516, 2384, 3032, 3427, 6064, 6854, 8717, 13708, 17434, 27416, 34868, 54832, 56471, 69736, 112942, 139472, 225884, 451768, 903536, 1298833, 2597666, 5195332, 10390664, 20781328]

約数ペア:

[(1, 20781328), (2, 10390664), (4, 5195332), (8, 2597666), (16, 1298833), (23, 903536), (46, 451768), (92, 225884), (149, 139472), (184, 112942), (298, 69736), (368, 56471), (379, 54832), (596, 34868), (758, 27416), (1192, 17434), (1516, 13708), (2384, 8717), (3032, 6854), (3427, 6064)]