399216760

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{321949}}^1$

素因数の和:321991

約数の個数: 32

約数和(自身を含む): 927216000

約数和(自身を除く): 527999240

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 321949, 643898, 1287796, 1609745, 2575592, 3219490, 6438980, 9980419, 12877960, 19960838, 39921676, 49902095, 79843352, 99804190, 199608380, 399216760]

約数ペア:

[(1, 399216760), (2, 199608380), (4, 99804190), (5, 79843352), (8, 49902095), (10, 39921676), (20, 19960838), (31, 12877960), (40, 9980419), (62, 6438980), (124, 3219490), (155, 2575592), (248, 1609745), (310, 1287796), (620, 643898), (1240, 321949)]