21140515

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{83}}^1\times {\mathrm{421}}^1$

素因数の和:531

約数の個数: 24

約数和(自身を含む): 28287504

約数和(自身を除く): 7146989

約数列:

[1, 5, 11, 55, 83, 121, 415, 421, 605, 913, 2105, 4565, 4631, 10043, 23155, 34943, 50215, 50941, 174715, 254705, 384373, 1921865, 4228103, 21140515]

約数ペア:

[(1, 21140515), (5, 4228103), (11, 1921865), (55, 384373), (83, 254705), (121, 174715), (415, 50941), (421, 50215), (605, 34943), (913, 23155), (2105, 10043), (4565, 4631)]