20509054 has 16 divisors (see below), whose sum is σ = 32631840. Its totient is φ = 9646560.

The previous prime is 20508997. The next prime is 20509057. The reversal of 20509054 is 45090502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20509057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (2039490).

Almost surely, 2^20509054 is an apocalyptic number.

20509054 is a deficient number, since it is larger than the sum of its proper divisors (12122786).

20509054 is a wasteful number, since it uses less digits than its factorization.

20509054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7395.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20509054 is about 4528.6923057324. The cubic root of 20509054 is about 273.7254696089.

Adding to 20509054 its reverse (45090502), we get a palindrome (65599556).

The spelling of 20509054 in words is "twenty million, five hundred nine thousand, fifty-four".