20977480

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1321}}^1$

素因数の和:1729

約数の個数: 32

約数和(自身を含む): 47354040

約数和(自身を除く): 26376560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1321, 1588, 1985, 2642, 3176, 3970, 5284, 6605, 7940, 10568, 13210, 15880, 26420, 52840, 524437, 1048874, 2097748, 2622185, 4195496, 5244370, 10488740, 20977480]

約数ペア:

[(1, 20977480), (2, 10488740), (4, 5244370), (5, 4195496), (8, 2622185), (10, 2097748), (20, 1048874), (40, 524437), (397, 52840), (794, 26420), (1321, 15880), (1588, 13210), (1985, 10568), (2642, 7940), (3176, 6605), (3970, 5284)]