20881250

素因数分解:

$2^1\times 5^5\times {\mathrm{13}}^1\times {\mathrm{257}}^1$

素因数の和:297

約数の個数: 48

約数和(自身を含む): 42325416

約数和(自身を除く): 21444166

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 125, 130, 250, 257, 325, 514, 625, 650, 1250, 1285, 1625, 2570, 3125, 3250, 3341, 6250, 6425, 6682, 8125, 12850, 16250, 16705, 32125, 33410, 40625, 64250, 81250, 83525, 160625, 167050, 321250, 417625, 803125, 835250, 1606250, 2088125, 4176250, 10440625, 20881250]

約数ペア:

[(1, 20881250), (2, 10440625), (5, 4176250), (10, 2088125), (13, 1606250), (25, 835250), (26, 803125), (50, 417625), (65, 321250), (125, 167050), (130, 160625), (250, 83525), (257, 81250), (325, 64250), (514, 40625), (625, 33410), (650, 32125), (1250, 16705), (1285, 16250), (1625, 12850), (2570, 8125), (3125, 6682), (3250, 6425), (3341, 6250)]