21108520

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{587}}^1$

素因数の和:658

約数の個数: 64

約数和(自身を含む): 50803200

約数和(自身を除く): 29694680

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 31, 40, 58, 62, 116, 124, 145, 155, 232, 248, 290, 310, 580, 587, 620, 899, 1160, 1174, 1240, 1798, 2348, 2935, 3596, 4495, 4696, 5870, 7192, 8990, 11740, 17023, 17980, 18197, 23480, 34046, 35960, 36394, 68092, 72788, 85115, 90985, 136184, 145576, 170230, 181970, 340460, 363940, 527713, 680920, 727880, 1055426, 2110852, 2638565, 4221704, 5277130, 10554260, 21108520]

約数ペア:

[(1, 21108520), (2, 10554260), (4, 5277130), (5, 4221704), (8, 2638565), (10, 2110852), (20, 1055426), (29, 727880), (31, 680920), (40, 527713), (58, 363940), (62, 340460), (116, 181970), (124, 170230), (145, 145576), (155, 136184), (232, 90985), (248, 85115), (290, 72788), (310, 68092), (580, 36394), (587, 35960), (620, 34046), (899, 23480), (1160, 18197), (1174, 17980), (1240, 17023), (1798, 11740), (2348, 8990), (2935, 7192), (3596, 5870), (4495, 4696)]