20721950

素因数分解:

$2^1\times 5^2\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{461}}^1$

素因数の和:533

約数の個数: 48

約数和(自身を含む): 41247360

約数和(自身を除く): 20525410

約数列:

[1, 2, 5, 10, 25, 29, 31, 50, 58, 62, 145, 155, 290, 310, 461, 725, 775, 899, 922, 1450, 1550, 1798, 2305, 4495, 4610, 8990, 11525, 13369, 14291, 22475, 23050, 26738, 28582, 44950, 66845, 71455, 133690, 142910, 334225, 357275, 414439, 668450, 714550, 828878, 2072195, 4144390, 10360975, 20721950]

約数ペア:

[(1, 20721950), (2, 10360975), (5, 4144390), (10, 2072195), (25, 828878), (29, 714550), (31, 668450), (50, 414439), (58, 357275), (62, 334225), (145, 142910), (155, 133690), (290, 71455), (310, 66845), (461, 44950), (725, 28582), (775, 26738), (899, 23050), (922, 22475), (1450, 14291), (1550, 13369), (1798, 11525), (2305, 8990), (4495, 4610)]