20249473547 has 4 divisors (see below), whose sum is σ = 20252187816. Its totient is φ = 20246759280.

The previous prime is 20249473529. The next prime is 20249473549. The reversal of 20249473547 is 74537494202.

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 20249473547 - 2²⁰ = 20248424971 is a prime.

It is a super-2 number, since 2×20249473547² (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 (20249473549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345913 + ... + 1360874.

It is an arithmetic number, because the mean of its divisors is an integer number (5063046954).

Almost surely, 2^20249473547 is an apocalyptic number.

20249473547 is a deficient number, since it is larger than the sum of its proper divisors (2714269).

20249473547 is an equidigital number, since it uses as much as digits as its factorization.

20249473547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714268.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 20249473547 in words is "twenty billion, two hundred forty-nine million, four hundred seventy-three thousand, five hundred forty-seven".