21442840

素因数分解:

$2^3\times 5^1\times {\mathrm{661}}^1\times {\mathrm{811}}^1$

素因数の和:1483

約数の個数: 32

約数和(自身を含む): 48378960

約数和(自身を除く): 26936120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 661, 811, 1322, 1622, 2644, 3244, 3305, 4055, 5288, 6488, 6610, 8110, 13220, 16220, 26440, 32440, 536071, 1072142, 2144284, 2680355, 4288568, 5360710, 10721420, 21442840]

約数ペア:

[(1, 21442840), (2, 10721420), (4, 5360710), (5, 4288568), (8, 2680355), (10, 2144284), (20, 1072142), (40, 536071), (661, 32440), (811, 26440), (1322, 16220), (1622, 13220), (2644, 8110), (3244, 6610), (3305, 6488), (4055, 5288)]