18440720

素因数分解:

$2^4\times 5^1\times {\mathrm{353}}^1\times {\mathrm{653}}^1$

素因数の和:1019

約数の個数: 40

約数和(自身を含む): 43061976

約数和(自身を除く): 24621256

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 353, 653, 706, 1306, 1412, 1765, 2612, 2824, 3265, 3530, 5224, 5648, 6530, 7060, 10448, 13060, 14120, 26120, 28240, 52240, 230509, 461018, 922036, 1152545, 1844072, 2305090, 3688144, 4610180, 9220360, 18440720]

約数ペア:

[(1, 18440720), (2, 9220360), (4, 4610180), (5, 3688144), (8, 2305090), (10, 1844072), (16, 1152545), (20, 922036), (40, 461018), (80, 230509), (353, 52240), (653, 28240), (706, 26120), (1306, 14120), (1412, 13060), (1765, 10448), (2612, 7060), (2824, 6530), (3265, 5648), (3530, 5224)]