19801880

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10103}}^1$

素因数の和:10128

約数の個数: 48

約数和(自身を含む): 51833520

約数和(自身を除く): 32031640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10103, 20206, 40412, 50515, 70721, 80824, 101030, 141442, 202060, 282884, 353605, 404120, 495047, 565768, 707210, 990094, 1414420, 1980188, 2475235, 2828840, 3960376, 4950470, 9900940, 19801880]

約数ペア:

[(1, 19801880), (2, 9900940), (4, 4950470), (5, 3960376), (7, 2828840), (8, 2475235), (10, 1980188), (14, 1414420), (20, 990094), (28, 707210), (35, 565768), (40, 495047), (49, 404120), (56, 353605), (70, 282884), (98, 202060), (140, 141442), (196, 101030), (245, 80824), (280, 70721), (392, 50515), (490, 40412), (980, 20206), (1960, 10103)]