20531528 has 16 divisors (see below), whose sum is σ = 39150000. Its totient is φ = 10091536.

The previous prime is 20531521. The next prime is 20531543. The reversal of 20531528 is 82513502.

It is a junction number, because it is equal to n+sod(n) for n = 20531497 and 20531506.

It is not an unprimeable number, because it can be changed into a prime (20531521) 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, 21278 + ... + 22221.

It is an arithmetic number, because the mean of its divisors is an integer number (2446875).

Almost surely, 2^20531528 is an apocalyptic number.

It is an amenable number.

20531528 is a deficient number, since it is larger than the sum of its proper divisors (18618472).

20531528 is a wasteful number, since it uses less digits than its factorization.

20531528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43564 (or 43560 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20531528 is about 4531.1729165857. The cubic root of 20531528 is about 273.8254166947.

The spelling of 20531528 in words is "twenty million, five hundred thirty-one thousand, five hundred twenty-eight".