21508890

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{421}}^1$

素因数の和:575

約数の個数: 64

約数和(自身を含む): 56149632

約数和(自身を除く): 34640742

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 131, 195, 262, 390, 393, 421, 655, 786, 842, 1263, 1310, 1703, 1965, 2105, 2526, 3406, 3930, 4210, 5109, 5473, 6315, 8515, 10218, 10946, 12630, 16419, 17030, 25545, 27365, 32838, 51090, 54730, 55151, 82095, 110302, 164190, 165453, 275755, 330906, 551510, 716963, 827265, 1433926, 1654530, 2150889, 3584815, 4301778, 7169630, 10754445, 21508890]

約数ペア:

[(1, 21508890), (2, 10754445), (3, 7169630), (5, 4301778), (6, 3584815), (10, 2150889), (13, 1654530), (15, 1433926), (26, 827265), (30, 716963), (39, 551510), (65, 330906), (78, 275755), (130, 165453), (131, 164190), (195, 110302), (262, 82095), (390, 55151), (393, 54730), (421, 51090), (655, 32838), (786, 27365), (842, 25545), (1263, 17030), (1310, 16419), (1703, 12630), (1965, 10946), (2105, 10218), (2526, 8515), (3406, 6315), (3930, 5473), (4210, 5109)]