21278295

素因数分解:

$3^5\times 5^1\times {\mathrm{83}}^1\times {\mathrm{211}}^1$

素因数の和:314

約数の個数: 48

約数和(自身を含む): 38892672

約数和(自身を除く): 17614377

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 83, 135, 211, 243, 249, 405, 415, 633, 747, 1055, 1215, 1245, 1899, 2241, 3165, 3735, 5697, 6723, 9495, 11205, 17091, 17513, 20169, 28485, 33615, 51273, 52539, 85455, 87565, 100845, 157617, 256365, 262695, 472851, 788085, 1418553, 2364255, 4255659, 7092765, 21278295]

約数ペア:

[(1, 21278295), (3, 7092765), (5, 4255659), (9, 2364255), (15, 1418553), (27, 788085), (45, 472851), (81, 262695), (83, 256365), (135, 157617), (211, 100845), (243, 87565), (249, 85455), (405, 52539), (415, 51273), (633, 33615), (747, 28485), (1055, 20169), (1215, 17513), (1245, 17091), (1899, 11205), (2241, 9495), (3165, 6723), (3735, 5697)]