21342680

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8747}}^1$

素因数の和:8819

約数の個数: 32

約数和(自身を含む): 48813840

約数和(自身を除く): 27471160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8747, 17494, 34988, 43735, 69976, 87470, 174940, 349880, 533567, 1067134, 2134268, 2667835, 4268536, 5335670, 10671340, 21342680]

約数ペア:

[(1, 21342680), (2, 10671340), (4, 5335670), (5, 4268536), (8, 2667835), (10, 2134268), (20, 1067134), (40, 533567), (61, 349880), (122, 174940), (244, 87470), (305, 69976), (488, 43735), (610, 34988), (1220, 17494), (2440, 8747)]