20523020451 has 32 divisors (see below), whose sum is σ = 28972277760. Its totient is φ = 12895987104.

The previous prime is 20523020447. The next prime is 20523020459. The reversal of 20523020451 is 15402032502.

It is not a de Polignac number, because 20523020451 - 2² = 20523020447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523020459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2978256 + ... + 2985138.

It is an arithmetic number, because the mean of its divisors is an integer number (905383680).

Almost surely, 2^20523020451 is an apocalyptic number.

20523020451 is a deficient number, since it is larger than the sum of its proper divisors (8449257309).

20523020451 is a wasteful number, since it uses less digits than its factorization.

20523020451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7535.

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 20523020451 its reverse (15402032502), we get a palindrome (35925052953).

The spelling of 20523020451 in words is "twenty billion, five hundred twenty-three million, twenty thousand, four hundred fifty-one".