20615985

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{691}}^1$

素因数の和:735

約数の個数: 64

約数和(自身を含む): 41852160

約数和(自身を除く): 21236175

約数列:

[1, 3, 5, 9, 13, 15, 17, 27, 39, 45, 51, 65, 85, 117, 135, 153, 195, 221, 255, 351, 459, 585, 663, 691, 765, 1105, 1755, 1989, 2073, 2295, 3315, 3455, 5967, 6219, 8983, 9945, 10365, 11747, 18657, 26949, 29835, 31095, 35241, 44915, 58735, 80847, 93285, 105723, 134745, 152711, 176205, 242541, 317169, 404235, 458133, 528615, 763555, 1212705, 1374399, 1585845, 2290665, 4123197, 6871995, 20615985]

約数ペア:

[(1, 20615985), (3, 6871995), (5, 4123197), (9, 2290665), (13, 1585845), (15, 1374399), (17, 1212705), (27, 763555), (39, 528615), (45, 458133), (51, 404235), (65, 317169), (85, 242541), (117, 176205), (135, 152711), (153, 134745), (195, 105723), (221, 93285), (255, 80847), (351, 58735), (459, 44915), (585, 35241), (663, 31095), (691, 29835), (765, 26949), (1105, 18657), (1755, 11747), (1989, 10365), (2073, 9945), (2295, 8983), (3315, 6219), (3455, 5967)]