20551839 has 16 divisors (see below), whose sum is σ = 34164480. Its totient is φ = 10676160.

The previous prime is 20551823. The next prime is 20551847. The reversal of 20551839 is 93815502.

It is not a de Polignac number, because 20551839 - 2⁴ = 20551823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44254 + ... + 44715.

It is an arithmetic number, because the mean of its divisors is an integer number (2135280).

Almost surely, 2^20551839 is an apocalyptic number.

20551839 is a deficient number, since it is larger than the sum of its proper divisors (13612641).

20551839 is a wasteful number, since it uses less digits than its factorization.

20551839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88990.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 20551839 is about 4533.4136144852. The cubic root of 20551839 is about 273.9156816938.

The spelling of 20551839 in words is "twenty million, five hundred fifty-one thousand, eight hundred thirty-nine".