18987705

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{431}}^1$

素因数の和:542

約数の個数: 48

約数和(自身を含む): 36391680

約数和(自身を除く): 17403975

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 89, 99, 165, 267, 431, 445, 495, 801, 979, 1293, 1335, 2155, 2937, 3879, 4005, 4741, 4895, 6465, 8811, 14223, 14685, 19395, 23705, 38359, 42669, 44055, 71115, 115077, 191795, 213345, 345231, 421949, 575385, 1265847, 1726155, 2109745, 3797541, 6329235, 18987705]

約数ペア:

[(1, 18987705), (3, 6329235), (5, 3797541), (9, 2109745), (11, 1726155), (15, 1265847), (33, 575385), (45, 421949), (55, 345231), (89, 213345), (99, 191795), (165, 115077), (267, 71115), (431, 44055), (445, 42669), (495, 38359), (801, 23705), (979, 19395), (1293, 14685), (1335, 14223), (2155, 8811), (2937, 6465), (3879, 4895), (4005, 4741)]