20425156251 has 32 divisors (see below), whose sum is σ = 27965502720. Its totient is φ = 13255949184.

The previous prime is 20425156231. The next prime is 20425156261. The reversal of 20425156251 is 15265152402.

It is not a de Polignac number, because 20425156251 - 2⁹ = 20425155739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20425156201) 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, 8664565 + ... + 8666921.

It is an arithmetic number, because the mean of its divisors is an integer number (873921960).

Almost surely, 2^20425156251 is an apocalyptic number.

20425156251 is a deficient number, since it is larger than the sum of its proper divisors (7540346469).

20425156251 is a wasteful number, since it uses less digits than its factorization.

20425156251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 20425156251 in words is "twenty billion, four hundred twenty-five million, one hundred fifty-six thousand, two hundred fifty-one".