21180933

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{127}}^1$

素因数の和:239

約数の個数: 40

約数和(自身を含む): 33454080

約数和(自身を除く): 12273147

約数列:

[1, 3, 9, 27, 29, 71, 81, 87, 127, 213, 261, 381, 639, 783, 1143, 1917, 2059, 2349, 3429, 3683, 5751, 6177, 9017, 10287, 11049, 18531, 27051, 33147, 55593, 81153, 99441, 166779, 243459, 261493, 298323, 730377, 784479, 2353437, 7060311, 21180933]

約数ペア:

[(1, 21180933), (3, 7060311), (9, 2353437), (27, 784479), (29, 730377), (71, 298323), (81, 261493), (87, 243459), (127, 166779), (213, 99441), (261, 81153), (381, 55593), (639, 33147), (783, 27051), (1143, 18531), (1917, 11049), (2059, 10287), (2349, 9017), (3429, 6177), (3683, 5751)]