20189365520

素因数分解:

$2^4\times 5^1\times {\mathrm{991}}^1\times {\mathrm{254659}}^1$

素因数の和:255663

約数の個数: 40

約数和(自身を含む): 46987825920

約数和(自身を除く): 26798460400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 991, 1982, 3964, 4955, 7928, 9910, 15856, 19820, 39640, 79280, 254659, 509318, 1018636, 1273295, 2037272, 2546590, 4074544, 5093180, 10186360, 20372720, 252367069, 504734138, 1009468276, 1261835345, 2018936552, 2523670690, 4037873104, 5047341380, 10094682760, 20189365520]

約数ペア:

[(1, 20189365520), (2, 10094682760), (4, 5047341380), (5, 4037873104), (8, 2523670690), (10, 2018936552), (16, 1261835345), (20, 1009468276), (40, 504734138), (80, 252367069), (991, 20372720), (1982, 10186360), (3964, 5093180), (4955, 4074544), (7928, 2546590), (9910, 2037272), (15856, 1273295), (19820, 1018636), (39640, 509318), (79280, 254659)]