21870860

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{1117}}^1$

素因数の和:1226

約数の個数: 48

約数和(自身を含む): 50712480

約数和(自身を除く): 28841620

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1117, 1780, 1958, 2234, 3916, 4468, 4895, 5585, 9790, 11170, 12287, 19580, 22340, 24574, 49148, 61435, 99413, 122870, 198826, 245740, 397652, 497065, 994130, 1093543, 1988260, 2187086, 4374172, 5467715, 10935430, 21870860]

約数ペア:

[(1, 21870860), (2, 10935430), (4, 5467715), (5, 4374172), (10, 2187086), (11, 1988260), (20, 1093543), (22, 994130), (44, 497065), (55, 397652), (89, 245740), (110, 198826), (178, 122870), (220, 99413), (356, 61435), (445, 49148), (890, 24574), (979, 22340), (1117, 19580), (1780, 12287), (1958, 11170), (2234, 9790), (3916, 5585), (4468, 4895)]