20547496321 has 4 divisors (see below), whose sum is σ = 22415450544. Its totient is φ = 18679542100.

The previous prime is 20547496309. The next prime is 20547496381. The reversal of 20547496321 is 12369474502.

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 20547496321 - 2²¹ = 20545399169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20547496381) 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, 933977095 + ... + 933977116.

It is an arithmetic number, because the mean of its divisors is an integer number (5603862636).

Almost surely, 2^20547496321 is an apocalyptic number.

It is an amenable number.

20547496321 is a deficient number, since it is larger than the sum of its proper divisors (1867954223).

20547496321 is a wasteful number, since it uses less digits than its factorization.

20547496321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867954222.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 20547496321 in words is "twenty billion, five hundred forty-seven million, four hundred ninety-six thousand, three hundred twenty-one".