20952380

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:326

約数の個数: 48

約数和(自身を含む): 45360000

約数和(自身を除く): 24407620

約数列:

[1, 2, 4, 5, 10, 20, 79, 89, 149, 158, 178, 298, 316, 356, 395, 445, 596, 745, 790, 890, 1490, 1580, 1780, 2980, 7031, 11771, 13261, 14062, 23542, 26522, 28124, 35155, 47084, 53044, 58855, 66305, 70310, 117710, 132610, 140620, 235420, 265220, 1047619, 2095238, 4190476, 5238095, 10476190, 20952380]

約数ペア:

[(1, 20952380), (2, 10476190), (4, 5238095), (5, 4190476), (10, 2095238), (20, 1047619), (79, 265220), (89, 235420), (149, 140620), (158, 132610), (178, 117710), (298, 70310), (316, 66305), (356, 58855), (395, 53044), (445, 47084), (596, 35155), (745, 28124), (790, 26522), (890, 23542), (1490, 14062), (1580, 13261), (1780, 11771), (2980, 7031)]