20545907 has 2 divisors, whose sum is σ = 20545908. Its totient is φ = 20545906.

The previous prime is 20545883. The next prime is 20545919. The reversal of 20545907 is 70954502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20545907 - 2¹⁶ = 20480371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20545937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272953 + 10272954.

It is an arithmetic number, because the mean of its divisors is an integer number (10272954).

Almost surely, 2^20545907 is an apocalyptic number.

20545907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545907 is an equidigital number, since it uses as much as digits as its factorization.

20545907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20545907 is about 4532.7593141485. The cubic root of 20545907 is about 273.8893251849.

The spelling of 20545907 in words is "twenty million, five hundred forty-five thousand, nine hundred seven".