20528770 has 8 divisors (see below), whose sum is σ = 36951804. Its totient is φ = 8211504.

The previous prime is 20528743. The next prime is 20528777. The reversal of 20528770 is 7782502.

It can be written as a sum of positive squares in 2 ways, for example, as 17313921 + 3214849 = 4161^2 + 1793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20528777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026429 + ... + 1026448.

Almost surely, 2^20528770 is an apocalyptic number.

20528770 is a deficient number, since it is larger than the sum of its proper divisors (16423034).

20528770 is a wasteful number, since it uses less digits than its factorization.

20528770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052884.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20528770 is about 4530.8685701530. The cubic root of 20528770 is about 273.8131551569.

The spelling of 20528770 in words is "twenty million, five hundred twenty-eight thousand, seven hundred seventy".