21031785

素因数分解:

$3^3\times 5^1\times {\mathrm{83}}^1\times {\mathrm{1877}}^1$

素因数の和:1974

約数の個数: 32

約数和(自身を含む): 37860480

約数和(自身を除く): 16828695

約数列:

[1, 3, 5, 9, 15, 27, 45, 83, 135, 249, 415, 747, 1245, 1877, 2241, 3735, 5631, 9385, 11205, 16893, 28155, 50679, 84465, 155791, 253395, 467373, 778955, 1402119, 2336865, 4206357, 7010595, 21031785]

約数ペア:

[(1, 21031785), (3, 7010595), (5, 4206357), (9, 2336865), (15, 1402119), (27, 778955), (45, 467373), (83, 253395), (135, 155791), (249, 84465), (415, 50679), (747, 28155), (1245, 16893), (1877, 11205), (2241, 9385), (3735, 5631)]