21072680

素因数分解:

$2^3\times 5^1\times {\mathrm{661}}^1\times {\mathrm{797}}^1$

素因数の和:1469

約数の個数: 32

約数和(自身を含む): 47544840

約数和(自身を除く): 26472160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 661, 797, 1322, 1594, 2644, 3188, 3305, 3985, 5288, 6376, 6610, 7970, 13220, 15940, 26440, 31880, 526817, 1053634, 2107268, 2634085, 4214536, 5268170, 10536340, 21072680]

約数ペア:

[(1, 21072680), (2, 10536340), (4, 5268170), (5, 4214536), (8, 2634085), (10, 2107268), (20, 1053634), (40, 526817), (661, 31880), (797, 26440), (1322, 15940), (1594, 13220), (2644, 7970), (3188, 6610), (3305, 6376), (3985, 5288)]