21381040

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3989}}^1$

素因数の和:4069

約数の個数: 40

約数和(自身を含む): 50465520

約数和(自身を除く): 29084480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3989, 5360, 7978, 15956, 19945, 31912, 39890, 63824, 79780, 159560, 267263, 319120, 534526, 1069052, 1336315, 2138104, 2672630, 4276208, 5345260, 10690520, 21381040]

約数ペア:

[(1, 21381040), (2, 10690520), (4, 5345260), (5, 4276208), (8, 2672630), (10, 2138104), (16, 1336315), (20, 1069052), (40, 534526), (67, 319120), (80, 267263), (134, 159560), (268, 79780), (335, 63824), (536, 39890), (670, 31912), (1072, 19945), (1340, 15956), (2680, 7978), (3989, 5360)]