20656480

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{9931}}^1$

素因数の和:9959

約数の個数: 48

約数和(自身を含む): 52560144

約数和(自身を除く): 31903664

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 9931, 19862, 39724, 49655, 79448, 99310, 129103, 158896, 198620, 258206, 317792, 397240, 516412, 645515, 794480, 1032824, 1291030, 1588960, 2065648, 2582060, 4131296, 5164120, 10328240, 20656480]

約数ペア:

[(1, 20656480), (2, 10328240), (4, 5164120), (5, 4131296), (8, 2582060), (10, 2065648), (13, 1588960), (16, 1291030), (20, 1032824), (26, 794480), (32, 645515), (40, 516412), (52, 397240), (65, 317792), (80, 258206), (104, 198620), (130, 158896), (160, 129103), (208, 99310), (260, 79448), (416, 49655), (520, 39724), (1040, 19862), (2080, 9931)]