21388760

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{367}}^1$

素因数の和:456

約数の個数: 64

約数和(自身を含む): 50872320

約数和(自身を除く): 29483560

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 47, 62, 94, 124, 155, 188, 235, 248, 310, 367, 376, 470, 620, 734, 940, 1240, 1457, 1468, 1835, 1880, 2914, 2936, 3670, 5828, 7285, 7340, 11377, 11656, 14570, 14680, 17249, 22754, 29140, 34498, 45508, 56885, 58280, 68996, 86245, 91016, 113770, 137992, 172490, 227540, 344980, 455080, 534719, 689960, 1069438, 2138876, 2673595, 4277752, 5347190, 10694380, 21388760]

約数ペア:

[(1, 21388760), (2, 10694380), (4, 5347190), (5, 4277752), (8, 2673595), (10, 2138876), (20, 1069438), (31, 689960), (40, 534719), (47, 455080), (62, 344980), (94, 227540), (124, 172490), (155, 137992), (188, 113770), (235, 91016), (248, 86245), (310, 68996), (367, 58280), (376, 56885), (470, 45508), (620, 34498), (734, 29140), (940, 22754), (1240, 17249), (1457, 14680), (1468, 14570), (1835, 11656), (1880, 11377), (2914, 7340), (2936, 7285), (3670, 5828)]