21005865

素因数分解:

$3^3\times 5^1\times {\mathrm{155599}}^1$

素因数の和:155613

約数の個数: 16

約数和(自身を含む): 37344000

約数和(自身を除く): 16338135

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 155599, 466797, 777995, 1400391, 2333985, 4201173, 7001955, 21005865]

約数ペア:

[(1, 21005865), (3, 7001955), (5, 4201173), (9, 2333985), (15, 1400391), (27, 777995), (45, 466797), (135, 155599)]