20161040 has 20 divisors (see below), whose sum is σ = 46874604. Its totient is φ = 8064384.

The previous prime is 20161027. The next prime is 20161079. The reversal of 20161040 is 4016102.

It can be written as a sum of positive squares in 2 ways, for example, as 16032016 + 4129024 = 4004^2 + 2032^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125927 + ... + 126086.

Almost surely, 2^20161040 is an apocalyptic number.

20161040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20161040 is an abundant number, since it is smaller than the sum of its proper divisors (26713564).

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

20161040 is a wasteful number, since it uses less digits than its factorization.

20161040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252026 (or 252020 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20161040 is about 4490.1046758400. The cubic root of 20161040 is about 272.1683646210.

Adding to 20161040 its reverse (4016102), we get a palindrome (24177142).

The spelling of 20161040 in words is "twenty million, one hundred sixty-one thousand, forty".