21291500

素因数分解:

$2^2\times 5^3\times {\mathrm{97}}^1\times {\mathrm{439}}^1$

素因数の和:555

約数の個数: 48

約数和(自身を含む): 47087040

約数和(自身を除く): 25795540

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 97, 100, 125, 194, 250, 388, 439, 485, 500, 878, 970, 1756, 1940, 2195, 2425, 4390, 4850, 8780, 9700, 10975, 12125, 21950, 24250, 42583, 43900, 48500, 54875, 85166, 109750, 170332, 212915, 219500, 425830, 851660, 1064575, 2129150, 4258300, 5322875, 10645750, 21291500]

約数ペア:

[(1, 21291500), (2, 10645750), (4, 5322875), (5, 4258300), (10, 2129150), (20, 1064575), (25, 851660), (50, 425830), (97, 219500), (100, 212915), (125, 170332), (194, 109750), (250, 85166), (388, 54875), (439, 48500), (485, 43900), (500, 42583), (878, 24250), (970, 21950), (1756, 12125), (1940, 10975), (2195, 9700), (2425, 8780), (4390, 4850)]