20513560

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{311}}^1$

素因数の和:436

約数の個数: 64

約数和(自身を含む): 49533120

約数和(自身を除く): 29019560

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 97, 136, 170, 194, 311, 340, 388, 485, 622, 680, 776, 970, 1244, 1555, 1649, 1940, 2488, 3110, 3298, 3880, 5287, 6220, 6596, 8245, 10574, 12440, 13192, 16490, 21148, 26435, 30167, 32980, 42296, 52870, 60334, 65960, 105740, 120668, 150835, 211480, 241336, 301670, 512839, 603340, 1025678, 1206680, 2051356, 2564195, 4102712, 5128390, 10256780, 20513560]

約数ペア:

[(1, 20513560), (2, 10256780), (4, 5128390), (5, 4102712), (8, 2564195), (10, 2051356), (17, 1206680), (20, 1025678), (34, 603340), (40, 512839), (68, 301670), (85, 241336), (97, 211480), (136, 150835), (170, 120668), (194, 105740), (311, 65960), (340, 60334), (388, 52870), (485, 42296), (622, 32980), (680, 30167), (776, 26435), (970, 21148), (1244, 16490), (1555, 13192), (1649, 12440), (1940, 10574), (2488, 8245), (3110, 6596), (3298, 6220), (3880, 5287)]