21453880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{397}}^1$

素因数の和:608

約数の個数: 64

約数和(自身を含む): 55592640

約数和(自身を除く): 34138760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 193, 280, 386, 397, 772, 794, 965, 1351, 1544, 1588, 1930, 1985, 2702, 2779, 3176, 3860, 3970, 5404, 5558, 6755, 7720, 7940, 10808, 11116, 13510, 13895, 15880, 22232, 27020, 27790, 54040, 55580, 76621, 111160, 153242, 306484, 383105, 536347, 612968, 766210, 1072694, 1532420, 2145388, 2681735, 3064840, 4290776, 5363470, 10726940, 21453880]

約数ペア:

[(1, 21453880), (2, 10726940), (4, 5363470), (5, 4290776), (7, 3064840), (8, 2681735), (10, 2145388), (14, 1532420), (20, 1072694), (28, 766210), (35, 612968), (40, 536347), (56, 383105), (70, 306484), (140, 153242), (193, 111160), (280, 76621), (386, 55580), (397, 54040), (772, 27790), (794, 27020), (965, 22232), (1351, 15880), (1544, 13895), (1588, 13510), (1930, 11116), (1985, 10808), (2702, 7940), (2779, 7720), (3176, 6755), (3860, 5558), (3970, 5404)]