55020331 has 4 divisors (see below), whose sum is σ = 55056672. Its totient is φ = 54983992.

The previous prime is 55020311. The next prime is 55020373. The reversal of 55020331 is 13302055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55020331 - 2⁵ = 55020299 is a prime.

It is a super-2 number, since 2×55020331² = 6054473646699122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55020299 and 55020308.

It is not an unprimeable number, because it can be changed into a prime (55020311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15796 + ... + 18961.

It is an arithmetic number, because the mean of its divisors is an integer number (13764168).

Almost surely, 2^55020331 is an apocalyptic number.

55020331 is a deficient number, since it is larger than the sum of its proper divisors (36341).

55020331 is a wasteful number, since it uses less digits than its factorization.

55020331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36340.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 55020331 is about 7417.5690761866. The cubic root of 55020331 is about 380.3420995922.

Adding to 55020331 its reverse (13302055), we get a palindrome (68322386).

The spelling of 55020331 in words is "fifty-five million, twenty thousand, three hundred thirty-one".