20235254251 has 4 divisors (see below), whose sum is σ = 20520257904. Its totient is φ = 19950250600.

The previous prime is 20235254233. The next prime is 20235254279. The reversal of 20235254251 is 15245253202.

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

It is a cyclic number.

It is not a de Polignac number, because 20235254251 - 2¹¹ = 20235252203 is a prime.

It is a super-2 number, since 2×20235254251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20235254051) 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, 142501720 + ... + 142501861.

It is an arithmetic number, because the mean of its divisors is an integer number (5130064476).

Almost surely, 2^20235254251 is an apocalyptic number.

20235254251 is a deficient number, since it is larger than the sum of its proper divisors (285003653).

20235254251 is an equidigital number, since it uses as much as digits as its factorization.

20235254251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285003652.

The product of its (nonzero) digits is 24000, while the sum is 31.

It can be divided in two parts, 2023525 and 4251, that added together give a square (2027776 = 1424²).

The spelling of 20235254251 in words is "twenty billion, two hundred thirty-five million, two hundred fifty-four thousand, two hundred fifty-one".