19815850

素因数分解:

$2^1\times 5^2\times {\mathrm{61}}^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1$

素因数の和:235

約数の個数: 48

約数和(自身を含む): 38401560

約数和(自身を除く): 18585710

約数列:

[1, 2, 5, 10, 25, 50, 61, 73, 89, 122, 146, 178, 305, 365, 445, 610, 730, 890, 1525, 1825, 2225, 3050, 3650, 4450, 4453, 5429, 6497, 8906, 10858, 12994, 22265, 27145, 32485, 44530, 54290, 64970, 111325, 135725, 162425, 222650, 271450, 324850, 396317, 792634, 1981585, 3963170, 9907925, 19815850]

約数ペア:

[(1, 19815850), (2, 9907925), (5, 3963170), (10, 1981585), (25, 792634), (50, 396317), (61, 324850), (73, 271450), (89, 222650), (122, 162425), (146, 135725), (178, 111325), (305, 64970), (365, 54290), (445, 44530), (610, 32485), (730, 27145), (890, 22265), (1525, 12994), (1825, 10858), (2225, 8906), (3050, 6497), (3650, 5429), (4450, 4453)]