20402868 has 24 divisors (see below), whose sum is σ = 47930400. Its totient is φ = 6754720.

The previous prime is 20402861. The next prime is 20402887. The reversal of 20402868 is 86820402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3918 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (1997100).

Almost surely, 2^20402868 is an apocalyptic number.

It is an amenable number.

20402868 is an abundant number, since it is smaller than the sum of its proper divisors (27527532).

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

20402868 is a wasteful number, since it uses less digits than its factorization.

20402868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11567 (or 11565 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 20402868 is about 4516.9533980328. The cubic root of 20402868 is about 273.2522457597.

The spelling of 20402868 in words is "twenty million, four hundred two thousand, eight hundred sixty-eight".