20538705 has 16 divisors (see below), whose sum is σ = 35849664. Its totient is φ = 9958080.

The previous prime is 20538691. The next prime is 20538773. The reversal of 20538705 is 50783502.

It is a happy number.

It is not a de Polignac number, because 20538705 - 2⁵ = 20538673 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62074 + ... + 62403.

It is an arithmetic number, because the mean of its divisors is an integer number (2240604).

Almost surely, 2^20538705 is an apocalyptic number.

It is an amenable number.

20538705 is a deficient number, since it is larger than the sum of its proper divisors (15310959).

20538705 is a wasteful number, since it uses less digits than its factorization.

20538705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124496.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20538705 is about 4531.9648056886. The cubic root of 20538705 is about 273.8573191111.

The spelling of 20538705 in words is "twenty million, five hundred thirty-eight thousand, seven hundred five".