21969820

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37879}}^1$

素因数の和:37917

約数の個数: 24

約数和(自身を含む): 47728800

約数和(自身を除く): 25758980

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 37879, 75758, 151516, 189395, 378790, 757580, 1098491, 2196982, 4393964, 5492455, 10984910, 21969820]

約数ペア:

[(1, 21969820), (2, 10984910), (4, 5492455), (5, 4393964), (10, 2196982), (20, 1098491), (29, 757580), (58, 378790), (116, 189395), (145, 151516), (290, 75758), (580, 37879)]