20025543451 has 4 divisors (see below), whose sum is σ = 20035140912. Its totient is φ = 20015945992.

The previous prime is 20025543427. The next prime is 20025543457. The reversal of 20025543451 is 15434552002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15434552002 = 2 ⋅7717276001.

It is a cyclic number.

It is not a de Polignac number, because 20025543451 - 2⁹ = 20025542939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20025543457) 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, 4795600 + ... + 4799773.

It is an arithmetic number, because the mean of its divisors is an integer number (5008785228).

Almost surely, 2^20025543451 is an apocalyptic number.

20025543451 is a deficient number, since it is larger than the sum of its proper divisors (9597461).

20025543451 is an equidigital number, since it uses as much as digits as its factorization.

20025543451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597460.

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

The spelling of 20025543451 in words is "twenty billion, twenty-five million, five hundred forty-three thousand, four hundred fifty-one".