21978255

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{2749}}^1$

素因数の和:2811

約数の個数: 32

約数和(自身を含む): 38808000

約数和(自身を除く): 16829745

約数列:

[1, 3, 5, 13, 15, 39, 41, 65, 123, 195, 205, 533, 615, 1599, 2665, 2749, 7995, 8247, 13745, 35737, 41235, 107211, 112709, 178685, 338127, 536055, 563545, 1465217, 1690635, 4395651, 7326085, 21978255]

約数ペア:

[(1, 21978255), (3, 7326085), (5, 4395651), (13, 1690635), (15, 1465217), (39, 563545), (41, 536055), (65, 338127), (123, 178685), (195, 112709), (205, 107211), (533, 41235), (615, 35737), (1599, 13745), (2665, 8247), (2749, 7995)]