20512402 has 4 divisors (see below), whose sum is σ = 30768606. Its totient is φ = 10256200.

The previous prime is 20512399. The next prime is 20512403. The reversal of 20512402 is 20421502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 5294601 = 3901^2 + 2301^2 .

It is not an unprimeable number, because it can be changed into a prime (20512403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128099 + ... + 5128102.

Almost surely, 2^20512402 is an apocalyptic number.

20512402 is a deficient number, since it is larger than the sum of its proper divisors (10256204).

20512402 is a wasteful number, since it uses less digits than its factorization.

20512402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10256203.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20512402 is about 4529.0619337783. The cubic root of 20512402 is about 273.7403635676.

Adding to 20512402 its reverse (20421502), we get a palindrome (40933904).

The spelling of 20512402 in words is "twenty million, five hundred twelve thousand, four hundred two".