21117885

素因数分解:

$3^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1\times {\mathrm{251}}^1$

素因数の和:409

約数の個数: 32

約数和(自身を含む): 34836480

約数和(自身を除く): 13718595

約数列:

[1, 3, 5, 15, 71, 79, 213, 237, 251, 355, 395, 753, 1065, 1185, 1255, 3765, 5609, 16827, 17821, 19829, 28045, 53463, 59487, 84135, 89105, 99145, 267315, 297435, 1407859, 4223577, 7039295, 21117885]

約数ペア:

[(1, 21117885), (3, 7039295), (5, 4223577), (15, 1407859), (71, 297435), (79, 267315), (213, 99145), (237, 89105), (251, 84135), (355, 59487), (395, 53463), (753, 28045), (1065, 19829), (1185, 17821), (1255, 16827), (3765, 5609)]