20280880

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3209}}^1$

素因数の和:3301

約数の個数: 40

約数和(自身を含む): 47764800

約数和(自身を除く): 27483920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3209, 6320, 6418, 12836, 16045, 25672, 32090, 51344, 64180, 128360, 253511, 256720, 507022, 1014044, 1267555, 2028088, 2535110, 4056176, 5070220, 10140440, 20280880]

約数ペア:

[(1, 20280880), (2, 10140440), (4, 5070220), (5, 4056176), (8, 2535110), (10, 2028088), (16, 1267555), (20, 1014044), (40, 507022), (79, 256720), (80, 253511), (158, 128360), (316, 64180), (395, 51344), (632, 32090), (790, 25672), (1264, 16045), (1580, 12836), (3160, 6418), (3209, 6320)]