20269878 has 16 divisors (see below), whose sum is σ = 41402880. Its totient is φ = 6612776.

The previous prime is 20269871. The next prime is 20269889. The reversal of 20269878 is 87896202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269871) 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, 35658 + ... + 36221.

It is an arithmetic number, because the mean of its divisors is an integer number (2587680).

Almost surely, 2^20269878 is an apocalyptic number.

20269878 is an abundant number, since it is smaller than the sum of its proper divisors (21133002).

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

20269878 is a wasteful number, since it uses less digits than its factorization.

20269878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71931.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 20269878 is about 4502.2081249094. The cubic root of 20269878 is about 272.6572467286.

The spelling of 20269878 in words is "twenty million, two hundred sixty-nine thousand, eight hundred seventy-eight".