21256780

素因数分解:

$2^2\times 5^1\times {\mathrm{503}}^1\times {\mathrm{2113}}^1$

素因数の和:2625

約数の個数: 24

約数和(自身を含む): 44749152

約数和(自身を除く): 23492372

約数列:

[1, 2, 4, 5, 10, 20, 503, 1006, 2012, 2113, 2515, 4226, 5030, 8452, 10060, 10565, 21130, 42260, 1062839, 2125678, 4251356, 5314195, 10628390, 21256780]

約数ペア:

[(1, 21256780), (2, 10628390), (4, 5314195), (5, 4251356), (10, 2125678), (20, 1062839), (503, 42260), (1006, 21130), (2012, 10565), (2113, 10060), (2515, 8452), (4226, 5030)]