21222500

素因数分解:

$2^2\times 5^4\times {\mathrm{13}}^1\times {\mathrm{653}}^1$

素因数の和:690

約数の個数: 60

約数和(自身を含む): 50055852

約数和(自身を除く): 28833352

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 100, 125, 130, 250, 260, 325, 500, 625, 650, 653, 1250, 1300, 1306, 1625, 2500, 2612, 3250, 3265, 6500, 6530, 8125, 8489, 13060, 16250, 16325, 16978, 32500, 32650, 33956, 42445, 65300, 81625, 84890, 163250, 169780, 212225, 326500, 408125, 424450, 816250, 848900, 1061125, 1632500, 2122250, 4244500, 5305625, 10611250, 21222500]

約数ペア:

[(1, 21222500), (2, 10611250), (4, 5305625), (5, 4244500), (10, 2122250), (13, 1632500), (20, 1061125), (25, 848900), (26, 816250), (50, 424450), (52, 408125), (65, 326500), (100, 212225), (125, 169780), (130, 163250), (250, 84890), (260, 81625), (325, 65300), (500, 42445), (625, 33956), (650, 32650), (653, 32500), (1250, 16978), (1300, 16325), (1306, 16250), (1625, 13060), (2500, 8489), (2612, 8125), (3250, 6530), (3265, 6500)]