21756995

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{223}}^1$

素因数の和:339

約数の個数: 32

約数和(自身を含む): 30105600

約数和(自身を除く): 8348605

約数列:

[1, 5, 13, 19, 65, 79, 95, 223, 247, 395, 1027, 1115, 1235, 1501, 2899, 4237, 5135, 7505, 14495, 17617, 19513, 21185, 55081, 88085, 97565, 229021, 275405, 334723, 1145105, 1673615, 4351399, 21756995]

約数ペア:

[(1, 21756995), (5, 4351399), (13, 1673615), (19, 1145105), (65, 334723), (79, 275405), (95, 229021), (223, 97565), (247, 88085), (395, 55081), (1027, 21185), (1115, 19513), (1235, 17617), (1501, 14495), (2899, 7505), (4237, 5135)]