21971187

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{257}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 38638080

約数和(自身を除く): 16666893

約数列:

[1, 3, 7, 9, 21, 23, 59, 63, 69, 161, 177, 207, 257, 413, 483, 531, 771, 1239, 1357, 1449, 1799, 2313, 3717, 4071, 5397, 5911, 9499, 12213, 15163, 16191, 17733, 28497, 41377, 45489, 53199, 85491, 106141, 124131, 136467, 318423, 348749, 372393, 955269, 1046247, 2441243, 3138741, 7323729, 21971187]

約数ペア:

[(1, 21971187), (3, 7323729), (7, 3138741), (9, 2441243), (21, 1046247), (23, 955269), (59, 372393), (63, 348749), (69, 318423), (161, 136467), (177, 124131), (207, 106141), (257, 85491), (413, 53199), (483, 45489), (531, 41377), (771, 28497), (1239, 17733), (1357, 16191), (1449, 15163), (1799, 12213), (2313, 9499), (3717, 5911), (4071, 5397)]