21189808

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{811}}^1$

素因数の和:913

約数の個数: 40

約数和(自身を含む): 43497216

約数和(自身を除く): 22307408

約数列:

[1, 2, 4, 8, 16, 23, 46, 71, 92, 142, 184, 284, 368, 568, 811, 1136, 1622, 1633, 3244, 3266, 6488, 6532, 12976, 13064, 18653, 26128, 37306, 57581, 74612, 115162, 149224, 230324, 298448, 460648, 921296, 1324363, 2648726, 5297452, 10594904, 21189808]

約数ペア:

[(1, 21189808), (2, 10594904), (4, 5297452), (8, 2648726), (16, 1324363), (23, 921296), (46, 460648), (71, 298448), (92, 230324), (142, 149224), (184, 115162), (284, 74612), (368, 57581), (568, 37306), (811, 26128), (1136, 18653), (1622, 13064), (1633, 12976), (3244, 6532), (3266, 6488)]