20990115

素因数分解:

$3^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{2971}}^1$

素因数の和:3139

約数の個数: 24

約数和(自身を含む): 36626928

約数和(自身を除く): 15636813

約数列:

[1, 3, 5, 9, 15, 45, 157, 471, 785, 1413, 2355, 2971, 7065, 8913, 14855, 26739, 44565, 133695, 466447, 1399341, 2332235, 4198023, 6996705, 20990115]

約数ペア:

[(1, 20990115), (3, 6996705), (5, 4198023), (9, 2332235), (15, 1399341), (45, 466447), (157, 133695), (471, 44565), (785, 26739), (1413, 14855), (2355, 8913), (2971, 7065)]