21900380

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{83}}^1\times {\mathrm{167}}^1$

素因数の和:338

約数の個数: 48

約数和(自身を含む): 47416320

約数和(自身を除く): 25515940

約数列:

[1, 2, 4, 5, 10, 20, 79, 83, 158, 166, 167, 316, 332, 334, 395, 415, 668, 790, 830, 835, 1580, 1660, 1670, 3340, 6557, 13114, 13193, 13861, 26228, 26386, 27722, 32785, 52772, 55444, 65570, 65965, 69305, 131140, 131930, 138610, 263860, 277220, 1095019, 2190038, 4380076, 5475095, 10950190, 21900380]

約数ペア:

[(1, 21900380), (2, 10950190), (4, 5475095), (5, 4380076), (10, 2190038), (20, 1095019), (79, 277220), (83, 263860), (158, 138610), (166, 131930), (167, 131140), (316, 69305), (332, 65965), (334, 65570), (395, 55444), (415, 52772), (668, 32785), (790, 27722), (830, 26386), (835, 26228), (1580, 13861), (1660, 13193), (1670, 13114), (3340, 6557)]