20521052 has 6 divisors (see below), whose sum is σ = 35911848. Its totient is φ = 10260524.

The previous prime is 20521049. The next prime is 20521063. The reversal of 20521052 is 25012502.

It is a super-2 number, since 2×20521052² = 842227150373408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2565128 + ... + 2565135.

It is an arithmetic number, because the mean of its divisors is an integer number (5985308).

Almost surely, 2^20521052 is an apocalyptic number.

It is an amenable number.

20521052 is a deficient number, since it is larger than the sum of its proper divisors (15390796).

20521052 is a wasteful number, since it uses less digits than its factorization.

20521052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130267 (or 5130265 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20521052 is about 4530.0167770109. The cubic root of 20521052 is about 273.7788365750.

Adding to 20521052 its reverse (25012502), we get a palindrome (45533554).

The spelling of 20521052 in words is "twenty million, five hundred twenty-one thousand, fifty-two".