20015838 has 12 divisors (see below), whose sum is σ = 43367688. Its totient is φ = 6671940.

The previous prime is 20015777. The next prime is 20015839. The reversal of 20015838 is 83851002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555978 + ... + 556013.

It is an arithmetic number, because the mean of its divisors is an integer number (3613974).

Almost surely, 2^20015838 is an apocalyptic number.

20015838 is an abundant number, since it is smaller than the sum of its proper divisors (23351850).

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

20015838 is a wasteful number, since it uses less digits than its factorization.

20015838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111999 (or 1111996 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20015838 is about 4473.9063468070. The cubic root of 20015838 is about 271.5133943312.

The spelling of 20015838 in words is "twenty million, fifteen thousand, eight hundred thirty-eight".