19780420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1913}}^1$

素因数の和:1980

約数の個数: 48

約数和(自身を含む): 46303488

約数和(自身を除く): 26523068

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 47, 55, 94, 110, 188, 220, 235, 470, 517, 940, 1034, 1913, 2068, 2585, 3826, 5170, 7652, 9565, 10340, 19130, 21043, 38260, 42086, 84172, 89911, 105215, 179822, 210430, 359644, 420860, 449555, 899110, 989021, 1798220, 1978042, 3956084, 4945105, 9890210, 19780420]

約数ペア:

[(1, 19780420), (2, 9890210), (4, 4945105), (5, 3956084), (10, 1978042), (11, 1798220), (20, 989021), (22, 899110), (44, 449555), (47, 420860), (55, 359644), (94, 210430), (110, 179822), (188, 105215), (220, 89911), (235, 84172), (470, 42086), (517, 38260), (940, 21043), (1034, 19130), (1913, 10340), (2068, 9565), (2585, 7652), (3826, 5170)]