21091720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{863}}^1$

素因数の和:934

約数の個数: 64

約数和(自身を含む): 52254720

約数和(自身を除く): 31163000

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 47, 52, 65, 94, 104, 130, 188, 235, 260, 376, 470, 520, 611, 863, 940, 1222, 1726, 1880, 2444, 3055, 3452, 4315, 4888, 6110, 6904, 8630, 11219, 12220, 17260, 22438, 24440, 34520, 40561, 44876, 56095, 81122, 89752, 112190, 162244, 202805, 224380, 324488, 405610, 448760, 527293, 811220, 1054586, 1622440, 2109172, 2636465, 4218344, 5272930, 10545860, 21091720]

約数ペア:

[(1, 21091720), (2, 10545860), (4, 5272930), (5, 4218344), (8, 2636465), (10, 2109172), (13, 1622440), (20, 1054586), (26, 811220), (40, 527293), (47, 448760), (52, 405610), (65, 324488), (94, 224380), (104, 202805), (130, 162244), (188, 112190), (235, 89752), (260, 81122), (376, 56095), (470, 44876), (520, 40561), (611, 34520), (863, 24440), (940, 22438), (1222, 17260), (1726, 12220), (1880, 11219), (2444, 8630), (3055, 6904), (3452, 6110), (4315, 4888)]