20523020351 has 4 divisors (see below), whose sum is σ = 20524457712. Its totient is φ = 20521582992.

The previous prime is 20523020327. The next prime is 20523020363. The reversal of 20523020351 is 15302032502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523020351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523026351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697046 + ... + 725891.

It is an arithmetic number, because the mean of its divisors is an integer number (5131114428).

Almost surely, 2^20523020351 is an apocalyptic number.

20523020351 is a deficient number, since it is larger than the sum of its proper divisors (1437361).

20523020351 is a wasteful number, since it uses less digits than its factorization.

20523020351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437360.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 20523020351 its reverse (15302032502), we get a palindrome (35825052853).

The spelling of 20523020351 in words is "twenty billion, five hundred twenty-three million, twenty thousand, three hundred fifty-one".