20391760

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6217}}^1$

素因数の和:6271

約数の個数: 40

約数和(自身を含む): 48575016

約数和(自身を除く): 28183256

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6217, 12434, 24868, 31085, 49736, 62170, 99472, 124340, 248680, 254897, 497360, 509794, 1019588, 1274485, 2039176, 2548970, 4078352, 5097940, 10195880, 20391760]

約数ペア:

[(1, 20391760), (2, 10195880), (4, 5097940), (5, 4078352), (8, 2548970), (10, 2039176), (16, 1274485), (20, 1019588), (40, 509794), (41, 497360), (80, 254897), (82, 248680), (164, 124340), (205, 99472), (328, 62170), (410, 49736), (656, 31085), (820, 24868), (1640, 12434), (3280, 6217)]