21395620

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{997}}^1$

素因数の和:1072

約数の個数: 48

約数和(自身を含む): 47784240

約数和(自身を除く): 26388620

約数列:

[1, 2, 4, 5, 10, 20, 29, 37, 58, 74, 116, 145, 148, 185, 290, 370, 580, 740, 997, 1073, 1994, 2146, 3988, 4292, 4985, 5365, 9970, 10730, 19940, 21460, 28913, 36889, 57826, 73778, 115652, 144565, 147556, 184445, 289130, 368890, 578260, 737780, 1069781, 2139562, 4279124, 5348905, 10697810, 21395620]

約数ペア:

[(1, 21395620), (2, 10697810), (4, 5348905), (5, 4279124), (10, 2139562), (20, 1069781), (29, 737780), (37, 578260), (58, 368890), (74, 289130), (116, 184445), (145, 147556), (148, 144565), (185, 115652), (290, 73778), (370, 57826), (580, 36889), (740, 28913), (997, 21460), (1073, 19940), (1994, 10730), (2146, 9970), (3988, 5365), (4292, 4985)]