21125780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{421}}^1$

素因数の和:636

約数の個数: 48

約数和(自身を含む): 48138384

約数和(自身を除く): 27012604

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 193, 260, 386, 421, 772, 842, 965, 1684, 1930, 2105, 2509, 3860, 4210, 5018, 5473, 8420, 10036, 10946, 12545, 21892, 25090, 27365, 50180, 54730, 81253, 109460, 162506, 325012, 406265, 812530, 1056289, 1625060, 2112578, 4225156, 5281445, 10562890, 21125780]

約数ペア:

[(1, 21125780), (2, 10562890), (4, 5281445), (5, 4225156), (10, 2112578), (13, 1625060), (20, 1056289), (26, 812530), (52, 406265), (65, 325012), (130, 162506), (193, 109460), (260, 81253), (386, 54730), (421, 50180), (772, 27365), (842, 25090), (965, 21892), (1684, 12545), (1930, 10946), (2105, 10036), (2509, 8420), (3860, 5473), (4210, 5018)]