20548281264 has 40 divisors (see below), whose sum is σ = 60666355200. Its totient is φ = 5870937408.

The previous prime is 20548281263. The next prime is 20548281307. The reversal of 20548281264 is 46218284502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20548281263) 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, 30577464 + ... + 30578135.

It is an arithmetic number, because the mean of its divisors is an integer number (1516658880).

Almost surely, 2^20548281264 is an apocalyptic number.

20548281264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20548281264 is an abundant number, since it is smaller than the sum of its proper divisors (40118073936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20548281264 is a wasteful number, since it uses less digits than its factorization.

20548281264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61155617 (or 61155611 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 42.

The spelling of 20548281264 in words is "twenty billion, five hundred forty-eight million, two hundred eighty-one thousand, two hundred sixty-four".