21321008

素因数分解:

$2^4\times {\mathrm{67}}^1\times {\mathrm{19889}}^1$

素因数の和:19964

約数の個数: 20

約数和(自身を含む): 41928120

約数和(自身を除く): 20607112

約数列:

[1, 2, 4, 8, 16, 67, 134, 268, 536, 1072, 19889, 39778, 79556, 159112, 318224, 1332563, 2665126, 5330252, 10660504, 21321008]

約数ペア:

[(1, 21321008), (2, 10660504), (4, 5330252), (8, 2665126), (16, 1332563), (67, 318224), (134, 159112), (268, 79556), (536, 39778), (1072, 19889)]