20168040 has 32 divisors (see below), whose sum is σ = 60504480. Its totient is φ = 5378112.

The previous prime is 20168009. The next prime is 20168041. The reversal of 20168040 is 4086102.

It is a junction number, because it is equal to n+sod(n) for n = 20167998 and 20168016.

It is not an unprimeable number, because it can be changed into a prime (20168041) 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, 83914 + ... + 84153.

It is an arithmetic number, because the mean of its divisors is an integer number (1890765).

Almost surely, 2^20168040 is an apocalyptic number.

20168040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20168040 is an abundant number, since it is smaller than the sum of its proper divisors (40336440).

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

20168040 is a wasteful number, since it uses less digits than its factorization.

20168040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168081 (or 168077 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20168040 is about 4490.8841000409. The cubic root of 20168040 is about 272.1998603193.

The spelling of 20168040 in words is "twenty million, one hundred sixty-eight thousand, forty".