20656857

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{457}}^1$

素因数の和:553

約数の個数: 32

約数和(自身を含む): 31803520

約数和(自身を除く): 11146663

約数列:

[1, 3, 13, 19, 39, 57, 61, 183, 247, 457, 741, 793, 1159, 1371, 2379, 3477, 5941, 8683, 15067, 17823, 26049, 27877, 45201, 83631, 112879, 338637, 362401, 529663, 1087203, 1588989, 6885619, 20656857]

約数ペア:

[(1, 20656857), (3, 6885619), (13, 1588989), (19, 1087203), (39, 529663), (57, 362401), (61, 338637), (183, 112879), (247, 83631), (457, 45201), (741, 27877), (793, 26049), (1159, 17823), (1371, 15067), (2379, 8683), (3477, 5941)]