20391728

素因数分解:

$2^4\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1877}}^1$

素因数の和:1989

約数の個数: 40

約数和(自身を含む): 45642912

約数和(自身を除く): 25251184

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 56, 97, 112, 194, 388, 679, 776, 1358, 1552, 1877, 2716, 3754, 5432, 7508, 10864, 13139, 15016, 26278, 30032, 52556, 105112, 182069, 210224, 364138, 728276, 1274483, 1456552, 2548966, 2913104, 5097932, 10195864, 20391728]

約数ペア:

[(1, 20391728), (2, 10195864), (4, 5097932), (7, 2913104), (8, 2548966), (14, 1456552), (16, 1274483), (28, 728276), (56, 364138), (97, 210224), (112, 182069), (194, 105112), (388, 52556), (679, 30032), (776, 26278), (1358, 15016), (1552, 13139), (1877, 10864), (2716, 7508), (3754, 5432)]