20721988

素因数分解:

$2^2\times 7^1\times {\mathrm{23}}^2\times {\mathrm{1399}}^1$

素因数の和:1456

約数の個数: 36

約数和(自身を含む): 43355200

約数和(自身を除く): 22633212

約数列:

[1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 529, 644, 1058, 1399, 2116, 2798, 3703, 5596, 7406, 9793, 14812, 19586, 32177, 39172, 64354, 128708, 225239, 450478, 740071, 900956, 1480142, 2960284, 5180497, 10360994, 20721988]

約数ペア:

[(1, 20721988), (2, 10360994), (4, 5180497), (7, 2960284), (14, 1480142), (23, 900956), (28, 740071), (46, 450478), (92, 225239), (161, 128708), (322, 64354), (529, 39172), (644, 32177), (1058, 19586), (1399, 14812), (2116, 9793), (2798, 7406), (3703, 5596)]