20278474264 has 32 divisors (see below), whose sum is σ = 39151941120. Its totient is φ = 9839390976.

The previous prime is 20278474247. The next prime is 20278474267. The reversal of 20278474264 is 46247487202.

It is a super-2 number, since 2×20278474264² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278474267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23932 + ... + 202804.

It is an arithmetic number, because the mean of its divisors is an integer number (1223498160).

Almost surely, 2^20278474264 is an apocalyptic number.

It is an amenable number.

20278474264 is a deficient number, since it is larger than the sum of its proper divisors (18873466856).

20278474264 is a wasteful number, since it uses less digits than its factorization.

20278474264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179299 (or 179295 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 46.

The spelling of 20278474264 in words is "twenty billion, two hundred seventy-eight million, four hundred seventy-four thousand, two hundred sixty-four".