20421760

素因数分解:

$2^7\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1877}}^1$

素因数の和:1913

約数の個数: 64

約数和(自身を含む): 51720120

約数和(自身を除く): 31298360

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 272, 320, 340, 544, 640, 680, 1088, 1360, 1877, 2176, 2720, 3754, 5440, 7508, 9385, 10880, 15016, 18770, 30032, 31909, 37540, 60064, 63818, 75080, 120128, 127636, 150160, 159545, 240256, 255272, 300320, 319090, 510544, 600640, 638180, 1021088, 1201280, 1276360, 2042176, 2552720, 4084352, 5105440, 10210880, 20421760]

約数ペア:

[(1, 20421760), (2, 10210880), (4, 5105440), (5, 4084352), (8, 2552720), (10, 2042176), (16, 1276360), (17, 1201280), (20, 1021088), (32, 638180), (34, 600640), (40, 510544), (64, 319090), (68, 300320), (80, 255272), (85, 240256), (128, 159545), (136, 150160), (160, 127636), (170, 120128), (272, 75080), (320, 63818), (340, 60064), (544, 37540), (640, 31909), (680, 30032), (1088, 18770), (1360, 15016), (1877, 10880), (2176, 9385), (2720, 7508), (3754, 5440)]