20521203 has 16 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 13367840.

The previous prime is 20521181. The next prime is 20521217. The reversal of 20521203 is 30212502.

It is a cyclic number.

It is not a de Polignac number, because 20521203 - 2⁹ = 20520691 is a prime.

It is a super-2 number, since 2×20521203² = 842239545134418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47398 + ... + 47828.

It is an arithmetic number, because the mean of its divisors is an integer number (1749600).

Almost surely, 2^20521203 is an apocalyptic number.

20521203 is a deficient number, since it is larger than the sum of its proper divisors (7472397).

20521203 is a wasteful number, since it uses less digits than its factorization.

20521203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20521203 is about 4530.0334435852. The cubic root of 20521203 is about 273.7795080887.

Adding to 20521203 its reverse (30212502), we get a palindrome (50733705).

The spelling of 20521203 in words is "twenty million, five hundred twenty-one thousand, two hundred three".