21640700

素因数分解:

$2^2\times 5^2\times {\mathrm{23}}^1\times {\mathrm{97}}^2$

素因数の和:231

約数の個数: 54

約数和(自身を含む): 49512456

約数和(自身を除く): 27871756

約数列:

[1, 2, 4, 5, 10, 20, 23, 25, 46, 50, 92, 97, 100, 115, 194, 230, 388, 460, 485, 575, 970, 1150, 1940, 2231, 2300, 2425, 4462, 4850, 8924, 9409, 9700, 11155, 18818, 22310, 37636, 44620, 47045, 55775, 94090, 111550, 188180, 216407, 223100, 235225, 432814, 470450, 865628, 940900, 1082035, 2164070, 4328140, 5410175, 10820350, 21640700]

約数ペア:

[(1, 21640700), (2, 10820350), (4, 5410175), (5, 4328140), (10, 2164070), (20, 1082035), (23, 940900), (25, 865628), (46, 470450), (50, 432814), (92, 235225), (97, 223100), (100, 216407), (115, 188180), (194, 111550), (230, 94090), (388, 55775), (460, 47045), (485, 44620), (575, 37636), (970, 22310), (1150, 18818), (1940, 11155), (2231, 9700), (2300, 9409), (2425, 8924), (4462, 4850)]