20521452 has 24 divisors (see below), whose sum is σ = 54724096. Its totient is φ = 5863248.

The previous prime is 20521447. The next prime is 20521453. The reversal of 20521452 is 25412502.

It is a happy number.

It is a super-2 number, since 2×20521452² = 842259984376608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20521453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122068 + ... + 122235.

Almost surely, 2^20521452 is an apocalyptic number.

It is an amenable number.

20521452 is an abundant number, since it is smaller than the sum of its proper divisors (34202644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20521452 is a wasteful number, since it uses less digits than its factorization.

20521452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244317 (or 244315 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20521452 is about 4530.0609267426. The cubic root of 20521452 is about 273.7806154121.

Adding to 20521452 its reverse (25412502), we get a palindrome (45933954).

The spelling of 20521452 in words is "twenty million, five hundred twenty-one thousand, four hundred fifty-two".