20724860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{1009}}^1$

素因数の和:1110

約数の個数: 48

約数和(自身を含む): 47510400

約数和(自身を除く): 26785540

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 79, 130, 158, 260, 316, 395, 790, 1009, 1027, 1580, 2018, 2054, 4036, 4108, 5045, 5135, 10090, 10270, 13117, 20180, 20540, 26234, 52468, 65585, 79711, 131170, 159422, 262340, 318844, 398555, 797110, 1036243, 1594220, 2072486, 4144972, 5181215, 10362430, 20724860]

約数ペア:

[(1, 20724860), (2, 10362430), (4, 5181215), (5, 4144972), (10, 2072486), (13, 1594220), (20, 1036243), (26, 797110), (52, 398555), (65, 318844), (79, 262340), (130, 159422), (158, 131170), (260, 79711), (316, 65585), (395, 52468), (790, 26234), (1009, 20540), (1027, 20180), (1580, 13117), (2018, 10270), (2054, 10090), (4036, 5135), (4108, 5045)]