21087639

素因数分解:

$3^2\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{541}}^1$

素因数の和:679

約数の個数: 24

約数和(自身を含む): 31453344

約数和(自身を除く): 10365705

約数列:

[1, 3, 9, 61, 71, 183, 213, 541, 549, 639, 1623, 4331, 4869, 12993, 33001, 38411, 38979, 99003, 115233, 297009, 345699, 2343071, 7029213, 21087639]

約数ペア:

[(1, 21087639), (3, 7029213), (9, 2343071), (61, 345699), (71, 297009), (183, 115233), (213, 99003), (541, 38979), (549, 38411), (639, 33001), (1623, 12993), (4331, 4869)]