81397240

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{28661}}^1$

素因数の和:28743

約数の個数: 32

約数和(自身を含む): 185729760

約数和(自身を除く): 104332520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 28661, 57322, 114644, 143305, 229288, 286610, 573220, 1146440, 2034931, 4069862, 8139724, 10174655, 16279448, 20349310, 40698620, 81397240]

約数ペア:

[(1, 81397240), (2, 40698620), (4, 20349310), (5, 16279448), (8, 10174655), (10, 8139724), (20, 4069862), (40, 2034931), (71, 1146440), (142, 573220), (284, 286610), (355, 229288), (568, 143305), (710, 114644), (1420, 57322), (2840, 28661)]