21340420

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{631}}^1$

素因数の和:748

約数の個数: 48

約数和(自身を含む): 47779200

約数和(自身を除く): 26438780

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 89, 95, 178, 190, 356, 380, 445, 631, 890, 1262, 1691, 1780, 2524, 3155, 3382, 6310, 6764, 8455, 11989, 12620, 16910, 23978, 33820, 47956, 56159, 59945, 112318, 119890, 224636, 239780, 280795, 561590, 1067021, 1123180, 2134042, 4268084, 5335105, 10670210, 21340420]

約数ペア:

[(1, 21340420), (2, 10670210), (4, 5335105), (5, 4268084), (10, 2134042), (19, 1123180), (20, 1067021), (38, 561590), (76, 280795), (89, 239780), (95, 224636), (178, 119890), (190, 112318), (356, 59945), (380, 56159), (445, 47956), (631, 33820), (890, 23978), (1262, 16910), (1691, 12620), (1780, 11989), (2524, 8455), (3155, 6764), (3382, 6310)]