20161668 has 48 divisors (see below), whose sum is σ = 49363776. Its totient is φ = 6397440.

The previous prime is 20161667. The next prime is 20161693. The reversal of 20161668 is 86616102.

It is not an unprimeable number, because it can be changed into a prime (20161667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20680 + ... + 21632.

It is an arithmetic number, because the mean of its divisors is an integer number (1028412).

Almost surely, 2^20161668 is an apocalyptic number.

It is an amenable number.

20161668 is an abundant number, since it is smaller than the sum of its proper divisors (29202108).

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

20161668 is a wasteful number, since it uses less digits than its factorization.

20161668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20161668 is about 4490.1746068499. The cubic root of 20161668 is about 272.1711905328.

The spelling of 20161668 in words is "twenty million, one hundred sixty-one thousand, six hundred sixty-eight".