20553081 has 8 divisors (see below), whose sum is σ = 27429024. Its totient is φ = 13689600.

The previous prime is 20553073. The next prime is 20553089. The reversal of 20553081 is 18035502.

It is an interprime number because it is at equal distance from previous prime (20553073) and next prime (20553089).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20553081 - 2³ = 20553073 is a prime.

It is a super-2 number, since 2×20553081² = 844858277185122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20553089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (3428628).

Almost surely, 2^20553081 is an apocalyptic number.

It is an amenable number.

20553081 is a deficient number, since it is larger than the sum of its proper divisors (6875943).

20553081 is a wasteful number, since it uses less digits than its factorization.

20553081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6231.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 20553081 is about 4533.5505952840. The cubic root of 20553081 is about 273.9211993902.

Adding to 20553081 its reverse (18035502), we get a palindrome (38588583).

The spelling of 20553081 in words is "twenty million, five hundred fifty-three thousand, eighty-one".