21247765

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{229}}^1\times {\mathrm{241}}^1$

素因数の和:493

約数の個数: 32

約数和(自身を含む): 32060160

約数和(自身を除く): 10812395

約数列:

[1, 5, 7, 11, 35, 55, 77, 229, 241, 385, 1145, 1205, 1603, 1687, 2519, 2651, 8015, 8435, 12595, 13255, 17633, 18557, 55189, 88165, 92785, 275945, 386323, 607079, 1931615, 3035395, 4249553, 21247765]

約数ペア:

[(1, 21247765), (5, 4249553), (7, 3035395), (11, 1931615), (35, 607079), (55, 386323), (77, 275945), (229, 92785), (241, 88165), (385, 55189), (1145, 18557), (1205, 17633), (1603, 13255), (1687, 12595), (2519, 8435), (2651, 8015)]