21175960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{211}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 51821280

約数和(自身を除く): 30645320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 193, 211, 260, 386, 422, 520, 772, 844, 965, 1055, 1544, 1688, 1930, 2110, 2509, 2743, 3860, 4220, 5018, 5486, 7720, 8440, 10036, 10972, 12545, 13715, 20072, 21944, 25090, 27430, 40723, 50180, 54860, 81446, 100360, 109720, 162892, 203615, 325784, 407230, 529399, 814460, 1058798, 1628920, 2117596, 2646995, 4235192, 5293990, 10587980, 21175960]

約数ペア:

[(1, 21175960), (2, 10587980), (4, 5293990), (5, 4235192), (8, 2646995), (10, 2117596), (13, 1628920), (20, 1058798), (26, 814460), (40, 529399), (52, 407230), (65, 325784), (104, 203615), (130, 162892), (193, 109720), (211, 100360), (260, 81446), (386, 54860), (422, 50180), (520, 40723), (772, 27430), (844, 25090), (965, 21944), (1055, 20072), (1544, 13715), (1688, 12545), (1930, 10972), (2110, 10036), (2509, 8440), (2743, 7720), (3860, 5486), (4220, 5018)]