20388520

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{193}}^1$

素因数の和:362

約数の個数: 64

約数和(自身を含む): 48888000

約数和(自身を除く): 28499480

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 139, 152, 190, 193, 278, 380, 386, 556, 695, 760, 772, 965, 1112, 1390, 1544, 1930, 2641, 2780, 3667, 3860, 5282, 5560, 7334, 7720, 10564, 13205, 14668, 18335, 21128, 26410, 26827, 29336, 36670, 52820, 53654, 73340, 105640, 107308, 134135, 146680, 214616, 268270, 509713, 536540, 1019426, 1073080, 2038852, 2548565, 4077704, 5097130, 10194260, 20388520]

約数ペア:

[(1, 20388520), (2, 10194260), (4, 5097130), (5, 4077704), (8, 2548565), (10, 2038852), (19, 1073080), (20, 1019426), (38, 536540), (40, 509713), (76, 268270), (95, 214616), (139, 146680), (152, 134135), (190, 107308), (193, 105640), (278, 73340), (380, 53654), (386, 52820), (556, 36670), (695, 29336), (760, 26827), (772, 26410), (965, 21128), (1112, 18335), (1390, 14668), (1544, 13205), (1930, 10564), (2641, 7720), (2780, 7334), (3667, 5560), (3860, 5282)]