20938960

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{269}}^1$

素因数の和:428

約数の個数: 80

約数和(自身を含む): 56246400

約数和(自身を除く): 35307440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 139, 140, 269, 278, 280, 538, 556, 560, 695, 973, 1076, 1112, 1345, 1390, 1883, 1946, 2152, 2224, 2690, 2780, 3766, 3892, 4304, 4865, 5380, 5560, 7532, 7784, 9415, 9730, 10760, 11120, 15064, 15568, 18830, 19460, 21520, 30128, 37391, 37660, 38920, 74782, 75320, 77840, 149564, 150640, 186955, 261737, 299128, 373910, 523474, 598256, 747820, 1046948, 1308685, 1495640, 2093896, 2617370, 2991280, 4187792, 5234740, 10469480, 20938960]

約数ペア:

[(1, 20938960), (2, 10469480), (4, 5234740), (5, 4187792), (7, 2991280), (8, 2617370), (10, 2093896), (14, 1495640), (16, 1308685), (20, 1046948), (28, 747820), (35, 598256), (40, 523474), (56, 373910), (70, 299128), (80, 261737), (112, 186955), (139, 150640), (140, 149564), (269, 77840), (278, 75320), (280, 74782), (538, 38920), (556, 37660), (560, 37391), (695, 30128), (973, 21520), (1076, 19460), (1112, 18830), (1345, 15568), (1390, 15064), (1883, 11120), (1946, 10760), (2152, 9730), (2224, 9415), (2690, 7784), (2780, 7532), (3766, 5560), (3892, 5380), (4304, 4865)]