21821660

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{3181}}^1$

素因数の和:3211

約数の個数: 48

約数和(自身を含む): 53457600

約数和(自身を除く): 31635940

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 490, 686, 980, 1372, 1715, 3181, 3430, 6362, 6860, 12724, 15905, 22267, 31810, 44534, 63620, 89068, 111335, 155869, 222670, 311738, 445340, 623476, 779345, 1091083, 1558690, 2182166, 3117380, 4364332, 5455415, 10910830, 21821660]

約数ペア:

[(1, 21821660), (2, 10910830), (4, 5455415), (5, 4364332), (7, 3117380), (10, 2182166), (14, 1558690), (20, 1091083), (28, 779345), (35, 623476), (49, 445340), (70, 311738), (98, 222670), (140, 155869), (196, 111335), (245, 89068), (343, 63620), (490, 44534), (686, 31810), (980, 22267), (1372, 15905), (1715, 12724), (3181, 6860), (3430, 6362)]