21561680

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{277}}^1$

素因数の和:436

約数の個数: 80

約数和(自身を含む): 57912960

約数和(自身を除く): 36351280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 139, 140, 277, 278, 280, 554, 556, 560, 695, 973, 1108, 1112, 1385, 1390, 1939, 1946, 2216, 2224, 2770, 2780, 3878, 3892, 4432, 4865, 5540, 5560, 7756, 7784, 9695, 9730, 11080, 11120, 15512, 15568, 19390, 19460, 22160, 31024, 38503, 38780, 38920, 77006, 77560, 77840, 154012, 155120, 192515, 269521, 308024, 385030, 539042, 616048, 770060, 1078084, 1347605, 1540120, 2156168, 2695210, 3080240, 4312336, 5390420, 10780840, 21561680]

約数ペア:

[(1, 21561680), (2, 10780840), (4, 5390420), (5, 4312336), (7, 3080240), (8, 2695210), (10, 2156168), (14, 1540120), (16, 1347605), (20, 1078084), (28, 770060), (35, 616048), (40, 539042), (56, 385030), (70, 308024), (80, 269521), (112, 192515), (139, 155120), (140, 154012), (277, 77840), (278, 77560), (280, 77006), (554, 38920), (556, 38780), (560, 38503), (695, 31024), (973, 22160), (1108, 19460), (1112, 19390), (1385, 15568), (1390, 15512), (1939, 11120), (1946, 11080), (2216, 9730), (2224, 9695), (2770, 7784), (2780, 7756), (3878, 5560), (3892, 5540), (4432, 4865)]