20615838 has 16 divisors (see below), whose sum is σ = 41283840. Its totient is φ = 6863256.

The previous prime is 20615831. The next prime is 20615851. The reversal of 20615838 is 83851602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20615799 and 20615808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615831) 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, 4581 + ... + 7887.

It is an arithmetic number, because the mean of its divisors is an integer number (2580240).

Almost surely, 2^20615838 is an apocalyptic number.

20615838 is an abundant number, since it is smaller than the sum of its proper divisors (20668002).

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

20615838 is a wasteful number, since it uses less digits than its factorization.

20615838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20615838 is about 4540.4667160987. The cubic root of 20615838 is about 274.1997140940.

The spelling of 20615838 in words is "twenty million, six hundred fifteen thousand, eight hundred thirty-eight".