20909660

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{691}}^1$

素因数の和:806

約数の個数: 48

約数和(自身を含む): 47083680

約数和(自身を除く): 26174020

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 89, 170, 178, 340, 356, 445, 691, 890, 1382, 1513, 1780, 2764, 3026, 3455, 6052, 6910, 7565, 11747, 13820, 15130, 23494, 30260, 46988, 58735, 61499, 117470, 122998, 234940, 245996, 307495, 614990, 1045483, 1229980, 2090966, 4181932, 5227415, 10454830, 20909660]

約数ペア:

[(1, 20909660), (2, 10454830), (4, 5227415), (5, 4181932), (10, 2090966), (17, 1229980), (20, 1045483), (34, 614990), (68, 307495), (85, 245996), (89, 234940), (170, 122998), (178, 117470), (340, 61499), (356, 58735), (445, 46988), (691, 30260), (890, 23494), (1382, 15130), (1513, 13820), (1780, 11747), (2764, 7565), (3026, 6910), (3455, 6052)]