21185840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1567}}^1$

素因数の和:1606

約数の個数: 60

約数和(自身を含む): 53371584

約数和(自身を除く): 32185744

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1567, 1690, 2704, 3134, 3380, 6268, 6760, 7835, 12536, 13520, 15670, 20371, 25072, 31340, 40742, 62680, 81484, 101855, 125360, 162968, 203710, 264823, 325936, 407420, 529646, 814840, 1059292, 1324115, 1629680, 2118584, 2648230, 4237168, 5296460, 10592920, 21185840]

約数ペア:

[(1, 21185840), (2, 10592920), (4, 5296460), (5, 4237168), (8, 2648230), (10, 2118584), (13, 1629680), (16, 1324115), (20, 1059292), (26, 814840), (40, 529646), (52, 407420), (65, 325936), (80, 264823), (104, 203710), (130, 162968), (169, 125360), (208, 101855), (260, 81484), (338, 62680), (520, 40742), (676, 31340), (845, 25072), (1040, 20371), (1352, 15670), (1567, 13520), (1690, 12536), (2704, 7835), (3134, 6760), (3380, 6268)]