21771760

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{6329}}^1$

素因数の和:6385

約数の個数: 40

約数和(自身を含む): 51804720

約数和(自身を除く): 30032960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 6329, 12658, 25316, 31645, 50632, 63290, 101264, 126580, 253160, 272147, 506320, 544294, 1088588, 1360735, 2177176, 2721470, 4354352, 5442940, 10885880, 21771760]

約数ペア:

[(1, 21771760), (2, 10885880), (4, 5442940), (5, 4354352), (8, 2721470), (10, 2177176), (16, 1360735), (20, 1088588), (40, 544294), (43, 506320), (80, 272147), (86, 253160), (172, 126580), (215, 101264), (344, 63290), (430, 50632), (688, 31645), (860, 25316), (1720, 12658), (3440, 6329)]