21125320

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2503}}^1$

素因数の和:2725

約数の個数: 32

約数和(自身を含む): 47776320

約数和(自身を除く): 26651000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2503, 4220, 5006, 8440, 10012, 12515, 20024, 25030, 50060, 100120, 528133, 1056266, 2112532, 2640665, 4225064, 5281330, 10562660, 21125320]

約数ペア:

[(1, 21125320), (2, 10562660), (4, 5281330), (5, 4225064), (8, 2640665), (10, 2112532), (20, 1056266), (40, 528133), (211, 100120), (422, 50060), (844, 25030), (1055, 20024), (1688, 12515), (2110, 10012), (2503, 8440), (4220, 5006)]