20219668 has 24 divisors (see below), whose sum is σ = 42198912. Its totient is φ = 8288544.

The previous prime is 20219653. The next prime is 20219669. The reversal of 20219668 is 86691202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219669) 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, 15055 + ... + 16342.

It is an arithmetic number, because the mean of its divisors is an integer number (1758288).

Almost surely, 2^20219668 is an apocalyptic number.

20219668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20219668 is an abundant number, since it is smaller than the sum of its proper divisors (21979244).

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

20219668 is a wasteful number, since it uses less digits than its factorization.

20219668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31431 (or 31429 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20219668 is about 4496.6285147875. The cubic root of 20219668 is about 272.4319298034.

The spelling of 20219668 in words is "twenty million, two hundred nineteen thousand, six hundred sixty-eight".