20974640

素因数分解:

$2^4\times 5^1\times {\mathrm{239}}^1\times {\mathrm{1097}}^1$

素因数の和:1349

約数の個数: 40

約数和(自身を含む): 49014720

約数和(自身を除く): 28040080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 239, 478, 956, 1097, 1195, 1912, 2194, 2390, 3824, 4388, 4780, 5485, 8776, 9560, 10970, 17552, 19120, 21940, 43880, 87760, 262183, 524366, 1048732, 1310915, 2097464, 2621830, 4194928, 5243660, 10487320, 20974640]

約数ペア:

[(1, 20974640), (2, 10487320), (4, 5243660), (5, 4194928), (8, 2621830), (10, 2097464), (16, 1310915), (20, 1048732), (40, 524366), (80, 262183), (239, 87760), (478, 43880), (956, 21940), (1097, 19120), (1195, 17552), (1912, 10970), (2194, 9560), (2390, 8776), (3824, 5485), (4388, 4780)]