81128780

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{66499}}^1$

素因数の和:66569

約数の個数: 24

約数和(自身を含む): 173166000

約数和(自身を除く): 92037220

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 66499, 132998, 265996, 332495, 664990, 1329980, 4056439, 8112878, 16225756, 20282195, 40564390, 81128780]

約数ペア:

[(1, 81128780), (2, 40564390), (4, 20282195), (5, 16225756), (10, 8112878), (20, 4056439), (61, 1329980), (122, 664990), (244, 332495), (305, 265996), (610, 132998), (1220, 66499)]