21238280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{751}}^1$

素因数の和:870

約数の個数: 64

約数和(自身を含む): 55226880

約数和(自身を除く): 33988600

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 101, 140, 202, 280, 404, 505, 707, 751, 808, 1010, 1414, 1502, 2020, 2828, 3004, 3535, 3755, 4040, 5257, 5656, 6008, 7070, 7510, 10514, 14140, 15020, 21028, 26285, 28280, 30040, 42056, 52570, 75851, 105140, 151702, 210280, 303404, 379255, 530957, 606808, 758510, 1061914, 1517020, 2123828, 2654785, 3034040, 4247656, 5309570, 10619140, 21238280]

約数ペア:

[(1, 21238280), (2, 10619140), (4, 5309570), (5, 4247656), (7, 3034040), (8, 2654785), (10, 2123828), (14, 1517020), (20, 1061914), (28, 758510), (35, 606808), (40, 530957), (56, 379255), (70, 303404), (101, 210280), (140, 151702), (202, 105140), (280, 75851), (404, 52570), (505, 42056), (707, 30040), (751, 28280), (808, 26285), (1010, 21028), (1414, 15020), (1502, 14140), (2020, 10514), (2828, 7510), (3004, 7070), (3535, 6008), (3755, 5656), (4040, 5257)]