21205653

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53147}}^1$

素因数の和:53176

約数の個数: 16

約数和(自身を含む): 34014720

約数和(自身を除く): 12809067

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53147, 159441, 372029, 1009793, 1116087, 3029379, 7068551, 21205653]

約数ペア:

[(1, 21205653), (3, 7068551), (7, 3029379), (19, 1116087), (21, 1009793), (57, 372029), (133, 159441), (399, 53147)]