20278545164 has 6 divisors (see below), whose sum is σ = 35487454044. Its totient is φ = 10139272580.

The previous prime is 20278545103. The next prime is 20278545167. The reversal of 20278545164 is 46154587202.

It is a super-2 number, since 2×20278545164² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20278545167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2534818142 + ... + 2534818149.

It is an arithmetic number, because the mean of its divisors is an integer number (5914575674).

Almost surely, 2^20278545164 is an apocalyptic number.

It is an amenable number.

20278545164 is a deficient number, since it is larger than the sum of its proper divisors (15208908880).

20278545164 is a wasteful number, since it uses less digits than its factorization.

20278545164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5069636295 (or 5069636293 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 20278545164 in words is "twenty billion, two hundred seventy-eight million, five hundred forty-five thousand, one hundred sixty-four".