20612500

素因数分解:

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

素因数の和:143

約数の個数: 72

約数和(自身を含む): 48231288

約数和(自身を除く): 27618788

約数列:

[1, 2, 4, 5, 10, 17, 20, 25, 34, 50, 68, 85, 97, 100, 125, 170, 194, 250, 340, 388, 425, 485, 500, 625, 850, 970, 1250, 1649, 1700, 1940, 2125, 2425, 2500, 3125, 3298, 4250, 4850, 6250, 6596, 8245, 8500, 9700, 10625, 12125, 12500, 16490, 21250, 24250, 32980, 41225, 42500, 48500, 53125, 60625, 82450, 106250, 121250, 164900, 206125, 212500, 242500, 303125, 412250, 606250, 824500, 1030625, 1212500, 2061250, 4122500, 5153125, 10306250, 20612500]

約数ペア:

[(1, 20612500), (2, 10306250), (4, 5153125), (5, 4122500), (10, 2061250), (17, 1212500), (20, 1030625), (25, 824500), (34, 606250), (50, 412250), (68, 303125), (85, 242500), (97, 212500), (100, 206125), (125, 164900), (170, 121250), (194, 106250), (250, 82450), (340, 60625), (388, 53125), (425, 48500), (485, 42500), (500, 41225), (625, 32980), (850, 24250), (970, 21250), (1250, 16490), (1649, 12500), (1700, 12125), (1940, 10625), (2125, 9700), (2425, 8500), (2500, 8245), (3125, 6596), (3298, 6250), (4250, 4850)]