21153020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{1087}}^1$

素因数の和:1242

約数の個数: 48

約数和(自身を含む): 51179520

約数和(自身を除く): 30026500

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 139, 140, 278, 556, 695, 973, 1087, 1390, 1946, 2174, 2780, 3892, 4348, 4865, 5435, 7609, 9730, 10870, 15218, 19460, 21740, 30436, 38045, 76090, 151093, 152180, 302186, 604372, 755465, 1057651, 1510930, 2115302, 3021860, 4230604, 5288255, 10576510, 21153020]

約数ペア:

[(1, 21153020), (2, 10576510), (4, 5288255), (5, 4230604), (7, 3021860), (10, 2115302), (14, 1510930), (20, 1057651), (28, 755465), (35, 604372), (70, 302186), (139, 152180), (140, 151093), (278, 76090), (556, 38045), (695, 30436), (973, 21740), (1087, 19460), (1390, 15218), (1946, 10870), (2174, 9730), (2780, 7609), (3892, 5435), (4348, 4865)]