21454820

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{367}}^1$

素因数の和:492

約数の個数: 48

約数和(自身を含む): 46986240

約数和(自身を除く): 25531420

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 79, 148, 158, 185, 316, 367, 370, 395, 734, 740, 790, 1468, 1580, 1835, 2923, 3670, 5846, 7340, 11692, 13579, 14615, 27158, 28993, 29230, 54316, 57986, 58460, 67895, 115972, 135790, 144965, 271580, 289930, 579860, 1072741, 2145482, 4290964, 5363705, 10727410, 21454820]

約数ペア:

[(1, 21454820), (2, 10727410), (4, 5363705), (5, 4290964), (10, 2145482), (20, 1072741), (37, 579860), (74, 289930), (79, 271580), (148, 144965), (158, 135790), (185, 115972), (316, 67895), (367, 58460), (370, 57986), (395, 54316), (734, 29230), (740, 28993), (790, 27158), (1468, 14615), (1580, 13579), (1835, 11692), (2923, 7340), (3670, 5846)]