20279109928 has 128 divisors (see below), whose sum is σ = 48538828800. Its totient is φ = 7712985600.

The previous prime is 20279109899. The next prime is 20279109953. The reversal of 20279109928 is 82990197202.

It is a super-2 number, since 2×20279109928² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16473073 + ... + 16474303.

It is an arithmetic number, because the mean of its divisors is an integer number (379209600).

Almost surely, 2^20279109928 is an apocalyptic number.

20279109928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20279109928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24269414400).

20279109928 is an abundant number, since it is smaller than the sum of its proper divisors (28259718872).

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

20279109928 is a wasteful number, since it uses less digits than its factorization.

20279109928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 20279109928 in words is "twenty billion, two hundred seventy-nine million, one hundred nine thousand, nine hundred twenty-eight".