20903805

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{277}}^1$

素因数の和:347

約数の個数: 64

約数和(自身を含む): 41099520

約数和(自身を除く): 20195715

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 43, 45, 65, 117, 129, 135, 195, 215, 277, 351, 387, 559, 585, 645, 831, 1161, 1385, 1677, 1755, 1935, 2493, 2795, 3601, 4155, 5031, 5805, 7479, 8385, 10803, 11911, 12465, 15093, 18005, 25155, 32409, 35733, 37395, 54015, 59555, 75465, 97227, 107199, 154843, 162045, 178665, 321597, 464529, 486135, 535995, 774215, 1393587, 1607985, 2322645, 4180761, 6967935, 20903805]

約数ペア:

[(1, 20903805), (3, 6967935), (5, 4180761), (9, 2322645), (13, 1607985), (15, 1393587), (27, 774215), (39, 535995), (43, 486135), (45, 464529), (65, 321597), (117, 178665), (129, 162045), (135, 154843), (195, 107199), (215, 97227), (277, 75465), (351, 59555), (387, 54015), (559, 37395), (585, 35733), (645, 32409), (831, 25155), (1161, 18005), (1385, 15093), (1677, 12465), (1755, 11911), (1935, 10803), (2493, 8385), (2795, 7479), (3601, 5805), (4155, 5031)]