20347173049 has 4 divisors (see below), whose sum is σ = 23253912064. Its totient is φ = 17440434036.

The previous prime is 20347173023. The next prime is 20347173073. The reversal of 20347173049 is 94037174302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20347173049 - 2¹³ = 20347164857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20347173019) 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, 1453369497 + ... + 1453369510.

It is an arithmetic number, because the mean of its divisors is an integer number (5813478016).

Almost surely, 2^20347173049 is an apocalyptic number.

It is an amenable number.

20347173049 is a deficient number, since it is larger than the sum of its proper divisors (2906739015).

20347173049 is an equidigital number, since it uses as much as digits as its factorization.

20347173049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906739014.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 20347173049 in words is "twenty billion, three hundred forty-seven million, one hundred seventy-three thousand, forty-nine".