21064940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81019}}^1$

素因数の和:81041

約数の個数: 24

約数和(自身を含む): 47639760

約数和(自身を除く): 26574820

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81019, 162038, 324076, 405095, 810190, 1053247, 1620380, 2106494, 4212988, 5266235, 10532470, 21064940]

約数ペア:

[(1, 21064940), (2, 10532470), (4, 5266235), (5, 4212988), (10, 2106494), (13, 1620380), (20, 1053247), (26, 810190), (52, 405095), (65, 324076), (130, 162038), (260, 81019)]