21157215

素因数分解:

$3^1\times 5^1\times {\mathrm{881}}^1\times {\mathrm{1601}}^1$

素因数の和:2490

約数の個数: 16

約数和(自身を含む): 33911136

約数和(自身を除く): 12753921

約数列:

[1, 3, 5, 15, 881, 1601, 2643, 4405, 4803, 8005, 13215, 24015, 1410481, 4231443, 7052405, 21157215]

約数ペア:

[(1, 21157215), (3, 7052405), (5, 4231443), (15, 1410481), (881, 24015), (1601, 13215), (2643, 8005), (4405, 4803)]