21311120

素因数分解:

$2^4\times 5^1\times {\mathrm{487}}^1\times {\mathrm{547}}^1$

素因数の和:1047

約数の個数: 40

約数和(自身を含む): 49740864

約数和(自身を除く): 28429744

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 487, 547, 974, 1094, 1948, 2188, 2435, 2735, 3896, 4376, 4870, 5470, 7792, 8752, 9740, 10940, 19480, 21880, 38960, 43760, 266389, 532778, 1065556, 1331945, 2131112, 2663890, 4262224, 5327780, 10655560, 21311120]

約数ペア:

[(1, 21311120), (2, 10655560), (4, 5327780), (5, 4262224), (8, 2663890), (10, 2131112), (16, 1331945), (20, 1065556), (40, 532778), (80, 266389), (487, 43760), (547, 38960), (974, 21880), (1094, 19480), (1948, 10940), (2188, 9740), (2435, 8752), (2735, 7792), (3896, 5470), (4376, 4870)]