20198920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{72139}}^1$

素因数の和:72157

約数の個数: 32

約数和(自身を含む): 51940800

約数和(自身を除く): 31741880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 72139, 144278, 288556, 360695, 504973, 577112, 721390, 1009946, 1442780, 2019892, 2524865, 2885560, 4039784, 5049730, 10099460, 20198920]

約数ペア:

[(1, 20198920), (2, 10099460), (4, 5049730), (5, 4039784), (7, 2885560), (8, 2524865), (10, 2019892), (14, 1442780), (20, 1009946), (28, 721390), (35, 577112), (40, 504973), (56, 360695), (70, 288556), (140, 144278), (280, 72139)]