21328780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{67}}^1\times {\mathrm{1447}}^1$

素因数の和:1534

約数の個数: 48

約数和(自身を含む): 49625856

約数和(自身を除く): 28297076

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 67, 110, 134, 220, 268, 335, 670, 737, 1340, 1447, 1474, 2894, 2948, 3685, 5788, 7235, 7370, 14470, 14740, 15917, 28940, 31834, 63668, 79585, 96949, 159170, 193898, 318340, 387796, 484745, 969490, 1066439, 1938980, 2132878, 4265756, 5332195, 10664390, 21328780]

約数ペア:

[(1, 21328780), (2, 10664390), (4, 5332195), (5, 4265756), (10, 2132878), (11, 1938980), (20, 1066439), (22, 969490), (44, 484745), (55, 387796), (67, 318340), (110, 193898), (134, 159170), (220, 96949), (268, 79585), (335, 63668), (670, 31834), (737, 28940), (1340, 15917), (1447, 14740), (1474, 14470), (2894, 7370), (2948, 7235), (3685, 5788)]