20874797547 has 4 divisors (see below), whose sum is σ = 27833063400. Its totient is φ = 13916531696.

The previous prime is 20874797533. The next prime is 20874797551. The reversal of 20874797547 is 74579747802.

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 20874797547 - 2⁸ = 20874797291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20874797527) 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, 3479132922 + ... + 3479132927.

It is an arithmetic number, because the mean of its divisors is an integer number (6958265850).

Almost surely, 2^20874797547 is an apocalyptic number.

20874797547 is a deficient number, since it is larger than the sum of its proper divisors (6958265853).

20874797547 is an equidigital number, since it uses as much as digits as its factorization.

20874797547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958265852.

The product of its (nonzero) digits is 27659520, while the sum is 60.

The spelling of 20874797547 in words is "twenty billion, eight hundred seventy-four million, seven hundred ninety-seven thousand, five hundred forty-seven".