20545264069 has 4 divisors (see below), whose sum is σ = 22413015360. Its totient is φ = 18677512780.

The previous prime is 20545264057. The next prime is 20545264079. The reversal of 20545264069 is 96046254502.

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 20545264069 - 2⁵ = 20545264037 is a prime.

It is a super-2 number, since 2×20545264069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545264079) 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, 933875629 + ... + 933875650.

It is an arithmetic number, because the mean of its divisors is an integer number (5603253840).

Almost surely, 2^20545264069 is an apocalyptic number.

It is an amenable number.

20545264069 is a deficient number, since it is larger than the sum of its proper divisors (1867751291).

20545264069 is a wasteful number, since it uses less digits than its factorization.

20545264069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867751290.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 20545264069 in words is "twenty billion, five hundred forty-five million, two hundred sixty-four thousand, sixty-nine".