19789780

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{541}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 43706880

約数和(自身を除く): 23917100

約数列:

[1, 2, 4, 5, 10, 20, 31, 59, 62, 118, 124, 155, 236, 295, 310, 541, 590, 620, 1082, 1180, 1829, 2164, 2705, 3658, 5410, 7316, 9145, 10820, 16771, 18290, 31919, 33542, 36580, 63838, 67084, 83855, 127676, 159595, 167710, 319190, 335420, 638380, 989489, 1978978, 3957956, 4947445, 9894890, 19789780]

約数ペア:

[(1, 19789780), (2, 9894890), (4, 4947445), (5, 3957956), (10, 1978978), (20, 989489), (31, 638380), (59, 335420), (62, 319190), (118, 167710), (124, 159595), (155, 127676), (236, 83855), (295, 67084), (310, 63838), (541, 36580), (590, 33542), (620, 31919), (1082, 18290), (1180, 16771), (1829, 10820), (2164, 9145), (2705, 7316), (3658, 5410)]