20778165

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{173}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 38598768

約数和(自身を除く): 17820603

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 157, 173, 255, 471, 519, 765, 785, 865, 1413, 1557, 2355, 2595, 2669, 2941, 7065, 7785, 8007, 8823, 13345, 14705, 24021, 26469, 27161, 40035, 44115, 81483, 120105, 132345, 135805, 244449, 407415, 461737, 1222245, 1385211, 2308685, 4155633, 6926055, 20778165]

約数ペア:

[(1, 20778165), (3, 6926055), (5, 4155633), (9, 2308685), (15, 1385211), (17, 1222245), (45, 461737), (51, 407415), (85, 244449), (153, 135805), (157, 132345), (173, 120105), (255, 81483), (471, 44115), (519, 40035), (765, 27161), (785, 26469), (865, 24021), (1413, 14705), (1557, 13345), (2355, 8823), (2595, 8007), (2669, 7785), (2941, 7065)]