20315800

素因数分解:

$2^3\times 5^2\times {\mathrm{157}}^1\times {\mathrm{647}}^1$

素因数の和:820

約数の個数: 48

約数和(自身を含む): 47608560

約数和(自身を除く): 27292760

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 157, 200, 314, 628, 647, 785, 1256, 1294, 1570, 2588, 3140, 3235, 3925, 5176, 6280, 6470, 7850, 12940, 15700, 16175, 25880, 31400, 32350, 64700, 101579, 129400, 203158, 406316, 507895, 812632, 1015790, 2031580, 2539475, 4063160, 5078950, 10157900, 20315800]

約数ペア:

[(1, 20315800), (2, 10157900), (4, 5078950), (5, 4063160), (8, 2539475), (10, 2031580), (20, 1015790), (25, 812632), (40, 507895), (50, 406316), (100, 203158), (157, 129400), (200, 101579), (314, 64700), (628, 32350), (647, 31400), (785, 25880), (1256, 16175), (1294, 15700), (1570, 12940), (2588, 7850), (3140, 6470), (3235, 6280), (3925, 5176)]