20971377

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{353}}^1$

素因数の和:430

約数の個数: 48

約数和(自身を含む): 37110528

約数和(自身を除く): 16139151

約数列:

[1, 3, 7, 9, 21, 23, 41, 63, 69, 123, 161, 207, 287, 353, 369, 483, 861, 943, 1059, 1449, 2471, 2583, 2829, 3177, 6601, 7413, 8119, 8487, 14473, 19803, 22239, 24357, 43419, 56833, 59409, 73071, 101311, 130257, 170499, 303933, 332879, 511497, 911799, 998637, 2330153, 2995911, 6990459, 20971377]

約数ペア:

[(1, 20971377), (3, 6990459), (7, 2995911), (9, 2330153), (21, 998637), (23, 911799), (41, 511497), (63, 332879), (69, 303933), (123, 170499), (161, 130257), (207, 101311), (287, 73071), (353, 59409), (369, 56833), (483, 43419), (861, 24357), (943, 22239), (1059, 19803), (1449, 14473), (2471, 8487), (2583, 8119), (2829, 7413), (3177, 6601)]