20420440

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{97}}^1\times {\mathrm{277}}^1$

素因数の和:404

約数の個数: 64

約数和(自身を含む): 49039200

約数和(自身を除く): 28618760

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 97, 152, 190, 194, 277, 380, 388, 485, 554, 760, 776, 970, 1108, 1385, 1843, 1940, 2216, 2770, 3686, 3880, 5263, 5540, 7372, 9215, 10526, 11080, 14744, 18430, 21052, 26315, 26869, 36860, 42104, 52630, 53738, 73720, 105260, 107476, 134345, 210520, 214952, 268690, 510511, 537380, 1021022, 1074760, 2042044, 2552555, 4084088, 5105110, 10210220, 20420440]

約数ペア:

[(1, 20420440), (2, 10210220), (4, 5105110), (5, 4084088), (8, 2552555), (10, 2042044), (19, 1074760), (20, 1021022), (38, 537380), (40, 510511), (76, 268690), (95, 214952), (97, 210520), (152, 134345), (190, 107476), (194, 105260), (277, 73720), (380, 53738), (388, 52630), (485, 42104), (554, 36860), (760, 26869), (776, 26315), (970, 21052), (1108, 18430), (1385, 14744), (1843, 11080), (1940, 10526), (2216, 9215), (2770, 7372), (3686, 5540), (3880, 5263)]