20780120

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{30559}}^1$

素因数の和:30587

約数の個数: 32

約数和(自身を含む): 49507200

約数和(自身を除く): 28727080

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 30559, 61118, 122236, 152795, 244472, 305590, 519503, 611180, 1039006, 1222360, 2078012, 2597515, 4156024, 5195030, 10390060, 20780120]

約数ペア:

[(1, 20780120), (2, 10390060), (4, 5195030), (5, 4156024), (8, 2597515), (10, 2078012), (17, 1222360), (20, 1039006), (34, 611180), (40, 519503), (68, 305590), (85, 244472), (136, 152795), (170, 122236), (340, 61118), (680, 30559)]