20521053 has 24 divisors (see below), whose sum is σ = 35367360. Its totient is φ = 11725560.

The previous prime is 20521049. The next prime is 20521063. The reversal of 20521053 is 35012502.

It is a happy number.

It is not a de Polignac number, because 20521053 - 2² = 20521049 is a prime.

It is a super-2 number, since 2×20521053² = 842227232457618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6433 + ... + 9078.

It is an arithmetic number, because the mean of its divisors is an integer number (1473640).

Almost surely, 2^20521053 is an apocalyptic number.

It is an amenable number.

20521053 is a deficient number, since it is larger than the sum of its proper divisors (14846307).

20521053 is a wasteful number, since it uses less digits than its factorization.

20521053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15534 (or 15521 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20521053 is about 4530.0168873857. The cubic root of 20521053 is about 273.7788410221.

Adding to 20521053 its reverse (35012502), we get a palindrome (55533555).

The spelling of 20521053 in words is "twenty million, five hundred twenty-one thousand, fifty-three".