20517440

素因数分解:

$2^6\times 5^1\times {\mathrm{97}}^1\times {\mathrm{661}}^1$

素因数の和:775

約数の個数: 56

約数和(自身を含む): 49435512

約数和(自身を除く): 28918072

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 97, 160, 194, 320, 388, 485, 661, 776, 970, 1322, 1552, 1940, 2644, 3104, 3305, 3880, 5288, 6208, 6610, 7760, 10576, 13220, 15520, 21152, 26440, 31040, 42304, 52880, 64117, 105760, 128234, 211520, 256468, 320585, 512936, 641170, 1025872, 1282340, 2051744, 2564680, 4103488, 5129360, 10258720, 20517440]

約数ペア:

[(1, 20517440), (2, 10258720), (4, 5129360), (5, 4103488), (8, 2564680), (10, 2051744), (16, 1282340), (20, 1025872), (32, 641170), (40, 512936), (64, 320585), (80, 256468), (97, 211520), (160, 128234), (194, 105760), (320, 64117), (388, 52880), (485, 42304), (661, 31040), (776, 26440), (970, 21152), (1322, 15520), (1552, 13220), (1940, 10576), (2644, 7760), (3104, 6610), (3305, 6208), (3880, 5288)]