20502705 has 16 divisors (see below), whose sum is σ = 32860800. Its totient is φ = 10915968.

The previous prime is 20502673. The next prime is 20502719. The reversal of 20502705 is 50720502.

It is not a de Polignac number, because 20502705 - 2⁵ = 20502673 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, 15084 + ... + 16386.

It is an arithmetic number, because the mean of its divisors is an integer number (2053800).

Almost surely, 2^20502705 is an apocalyptic number.

It is an amenable number.

20502705 is a deficient number, since it is larger than the sum of its proper divisors (12358095).

20502705 is a wasteful number, since it uses less digits than its factorization.

20502705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360.

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20502705 is about 4527.9912764934. The cubic root of 20502705 is about 273.6972209084.

The spelling of 20502705 in words is "twenty million, five hundred two thousand, seven hundred five".