21081249

素因数分解:

$3^3\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1571}}^1$

素因数の和:1658

約数の個数: 32

約数和(自身を含む): 36218880

約数和(自身を除く): 15137631

約数列:

[1, 3, 7, 9, 21, 27, 63, 71, 189, 213, 497, 639, 1491, 1571, 1917, 4473, 4713, 10997, 13419, 14139, 32991, 42417, 98973, 111541, 296919, 334623, 780787, 1003869, 2342361, 3011607, 7027083, 21081249]

約数ペア:

[(1, 21081249), (3, 7027083), (7, 3011607), (9, 2342361), (21, 1003869), (27, 780787), (63, 334623), (71, 296919), (189, 111541), (213, 98973), (497, 42417), (639, 32991), (1491, 14139), (1571, 13419), (1917, 10997), (4473, 4713)]