20505980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{1123}}^1$

素因数の和:1226

約数の個数: 48

約数和(自身を含む): 47585664

約数和(自身を除く): 27079684

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 83, 110, 166, 220, 332, 415, 830, 913, 1123, 1660, 1826, 2246, 3652, 4492, 4565, 5615, 9130, 11230, 12353, 18260, 22460, 24706, 49412, 61765, 93209, 123530, 186418, 247060, 372836, 466045, 932090, 1025299, 1864180, 2050598, 4101196, 5126495, 10252990, 20505980]

約数ペア:

[(1, 20505980), (2, 10252990), (4, 5126495), (5, 4101196), (10, 2050598), (11, 1864180), (20, 1025299), (22, 932090), (44, 466045), (55, 372836), (83, 247060), (110, 186418), (166, 123530), (220, 93209), (332, 61765), (415, 49412), (830, 24706), (913, 22460), (1123, 18260), (1660, 12353), (1826, 11230), (2246, 9130), (3652, 5615), (4492, 4565)]