21031407

素因数分解:

$3^5\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1$

素因数の和:162

約数の個数: 48

約数和(自身を含む): 33965568

約数和(自身を除く): 12934161

約数列:

[1, 3, 9, 23, 27, 53, 69, 71, 81, 159, 207, 213, 243, 477, 621, 639, 1219, 1431, 1633, 1863, 1917, 3657, 3763, 4293, 4899, 5589, 5751, 10971, 11289, 12879, 14697, 17253, 32913, 33867, 44091, 86549, 98739, 101601, 132273, 259647, 296217, 304803, 396819, 778941, 914409, 2336823, 7010469, 21031407]

約数ペア:

[(1, 21031407), (3, 7010469), (9, 2336823), (23, 914409), (27, 778941), (53, 396819), (69, 304803), (71, 296217), (81, 259647), (159, 132273), (207, 101601), (213, 98739), (243, 86549), (477, 44091), (621, 33867), (639, 32913), (1219, 17253), (1431, 14697), (1633, 12879), (1863, 11289), (1917, 10971), (3657, 5751), (3763, 5589), (4293, 4899)]