21387320

素因数分解:

$2^3\times 5^1\times {\mathrm{271}}^1\times {\mathrm{1973}}^1$

素因数の和:2255

約数の個数: 32

約数和(自身を含む): 48323520

約数和(自身を除く): 26936200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 271, 542, 1084, 1355, 1973, 2168, 2710, 3946, 5420, 7892, 9865, 10840, 15784, 19730, 39460, 78920, 534683, 1069366, 2138732, 2673415, 4277464, 5346830, 10693660, 21387320]

約数ペア:

[(1, 21387320), (2, 10693660), (4, 5346830), (5, 4277464), (8, 2673415), (10, 2138732), (20, 1069366), (40, 534683), (271, 78920), (542, 39460), (1084, 19730), (1355, 15784), (1973, 10840), (2168, 9865), (2710, 7892), (3946, 5420)]