21820240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20981}}^1$

素因数の和:21007

約数の個数: 40

約数和(自身を含む): 54637128

約数和(自身を除く): 32816888

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20981, 41962, 83924, 104905, 167848, 209810, 272753, 335696, 419620, 545506, 839240, 1091012, 1363765, 1678480, 2182024, 2727530, 4364048, 5455060, 10910120, 21820240]

約数ペア:

[(1, 21820240), (2, 10910120), (4, 5455060), (5, 4364048), (8, 2727530), (10, 2182024), (13, 1678480), (16, 1363765), (20, 1091012), (26, 839240), (40, 545506), (52, 419620), (65, 335696), (80, 272753), (104, 209810), (130, 167848), (208, 104905), (260, 83924), (520, 41962), (1040, 20981)]