20821550

素因数分解:

$2^1\times 5^2\times {\mathrm{89}}^1\times {\mathrm{4679}}^1$

素因数の和:4780

約数の個数: 24

約数和(自身を含む): 39171600

約数和(自身を除く): 18350050

約数列:

[1, 2, 5, 10, 25, 50, 89, 178, 445, 890, 2225, 4450, 4679, 9358, 23395, 46790, 116975, 233950, 416431, 832862, 2082155, 4164310, 10410775, 20821550]

約数ペア:

[(1, 20821550), (2, 10410775), (5, 4164310), (10, 2082155), (25, 832862), (50, 416431), (89, 233950), (178, 116975), (445, 46790), (890, 23395), (2225, 9358), (4450, 4679)]