21512505

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{211}}^1\times {\mathrm{971}}^1$

素因数の和:1197

約数の個数: 32

約数和(自身を含む): 39564288

約数和(自身を除く): 18051783

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 211, 633, 971, 1055, 1477, 2913, 3165, 4431, 4855, 6797, 7385, 14565, 20391, 22155, 33985, 101955, 204881, 614643, 1024405, 1434167, 3073215, 4302501, 7170835, 21512505]

約数ペア:

[(1, 21512505), (3, 7170835), (5, 4302501), (7, 3073215), (15, 1434167), (21, 1024405), (35, 614643), (105, 204881), (211, 101955), (633, 33985), (971, 22155), (1055, 20391), (1477, 14565), (2913, 7385), (3165, 6797), (4431, 4855)]