21135978890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{409}}^1\times {\mathrm{397517}}^1$

素因数の和:397946

約数の個数: 32

約数和(自身を含む): 41071559760

約数和(自身を除く): 19935580870

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 409, 818, 2045, 4090, 5317, 10634, 26585, 53170, 397517, 795034, 1987585, 3975170, 5167721, 10335442, 25838605, 51677210, 162584453, 325168906, 812922265, 1625844530, 2113597889, 4227195778, 10567989445, 21135978890]

約数ペア:

[(1, 21135978890), (2, 10567989445), (5, 4227195778), (10, 2113597889), (13, 1625844530), (26, 812922265), (65, 325168906), (130, 162584453), (409, 51677210), (818, 25838605), (2045, 10335442), (4090, 5167721), (5317, 3975170), (10634, 1987585), (26585, 795034), (53170, 397517)]