81398440

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{25759}}^1$

素因数の和:25849

約数の個数: 32

約数和(自身を含む): 185472000

約数和(自身を除く): 104073560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 316, 395, 632, 790, 1580, 3160, 25759, 51518, 103036, 128795, 206072, 257590, 515180, 1030360, 2034961, 4069922, 8139844, 10174805, 16279688, 20349610, 40699220, 81398440]

約数ペア:

[(1, 81398440), (2, 40699220), (4, 20349610), (5, 16279688), (8, 10174805), (10, 8139844), (20, 4069922), (40, 2034961), (79, 1030360), (158, 515180), (316, 257590), (395, 206072), (632, 128795), (790, 103036), (1580, 51518), (3160, 25759)]