20990205

素因数分解:

$3^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{1747}}^1$

素因数の和:1850

約数の個数: 32

約数和(自身を含む): 37756800

約数和(自身を除く): 16766595

約数列:

[1, 3, 5, 9, 15, 27, 45, 89, 135, 267, 445, 801, 1335, 1747, 2403, 4005, 5241, 8735, 12015, 15723, 26205, 47169, 78615, 155483, 235845, 466449, 777415, 1399347, 2332245, 4198041, 6996735, 20990205]

約数ペア:

[(1, 20990205), (3, 6996735), (5, 4198041), (9, 2332245), (15, 1399347), (27, 777415), (45, 466449), (89, 235845), (135, 155483), (267, 78615), (445, 47169), (801, 26205), (1335, 15723), (1747, 12015), (2403, 8735), (4005, 5241)]