20400052 has 12 divisors (see below), whose sum is σ = 35915040. Its totient is φ = 10138616.

The previous prime is 20400049. The next prime is 20400059. The reversal of 20400052 is 25000402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400059) 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, 14602 + ... + 15937.

It is an arithmetic number, because the mean of its divisors is an integer number (2992920).

Almost surely, 2^20400052 is an apocalyptic number.

It is an amenable number.

20400052 is a deficient number, since it is larger than the sum of its proper divisors (15514988).

20400052 is a wasteful number, since it uses less digits than its factorization.

20400052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30710 (or 30708 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20400052 is about 4516.6416727476. The cubic root of 20400052 is about 273.2396737735.

Adding to 20400052 its reverse (25000402), we get a palindrome (45400454).

The spelling of 20400052 in words is "twenty million, four hundred thousand, fifty-two".