21681380

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{251}}^1\times {\mathrm{617}}^1$

素因数の和:884

約数の個数: 48

約数和(自身を含む): 52327296

約数和(自身を除く): 30645916

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 251, 502, 617, 1004, 1234, 1255, 1757, 2468, 2510, 3085, 3514, 4319, 5020, 6170, 7028, 8638, 8785, 12340, 17276, 17570, 21595, 35140, 43190, 86380, 154867, 309734, 619468, 774335, 1084069, 1548670, 2168138, 3097340, 4336276, 5420345, 10840690, 21681380]

約数ペア:

[(1, 21681380), (2, 10840690), (4, 5420345), (5, 4336276), (7, 3097340), (10, 2168138), (14, 1548670), (20, 1084069), (28, 774335), (35, 619468), (70, 309734), (140, 154867), (251, 86380), (502, 43190), (617, 35140), (1004, 21595), (1234, 17570), (1255, 17276), (1757, 12340), (2468, 8785), (2510, 8638), (3085, 7028), (3514, 6170), (4319, 5020)]