20447505

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{191}}^1$

素因数の和:279

約数の個数: 64

約数和(自身を含む): 39997440

約数和(自身を除く): 19549935

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 61, 65, 117, 135, 183, 191, 195, 305, 351, 549, 573, 585, 793, 915, 955, 1647, 1719, 1755, 2379, 2483, 2745, 2865, 3965, 5157, 7137, 7449, 8235, 8595, 11651, 11895, 12415, 21411, 22347, 25785, 34953, 35685, 37245, 58255, 67041, 104859, 107055, 111735, 151463, 174765, 314577, 335205, 454389, 524295, 757315, 1363167, 1572885, 2271945, 4089501, 6815835, 20447505]

約数ペア:

[(1, 20447505), (3, 6815835), (5, 4089501), (9, 2271945), (13, 1572885), (15, 1363167), (27, 757315), (39, 524295), (45, 454389), (61, 335205), (65, 314577), (117, 174765), (135, 151463), (183, 111735), (191, 107055), (195, 104859), (305, 67041), (351, 58255), (549, 37245), (573, 35685), (585, 34953), (793, 25785), (915, 22347), (955, 21411), (1647, 12415), (1719, 11895), (1755, 11651), (2379, 8595), (2483, 8235), (2745, 7449), (2865, 7137), (3965, 5157)]