20553131 has 4 divisors (see below), whose sum is σ = 20591664. Its totient is φ = 20514600.

The previous prime is 20553107. The next prime is 20553133. The reversal of 20553131 is 13135502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13135502 = 2 ⋅6567751.

It is a cyclic number.

It is not a de Polignac number, because 20553131 - 2⁶ = 20553067 is a prime.

It is a super-2 number, since 2×20553131² = 844862387806322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20553133) 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, 18455 + ... + 19536.

It is an arithmetic number, because the mean of its divisors is an integer number (5147916).

Almost surely, 2^20553131 is an apocalyptic number.

20553131 is a deficient number, since it is larger than the sum of its proper divisors (38533).

20553131 is an equidigital number, since it uses as much as digits as its factorization.

20553131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38532.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 20553131 is about 4533.5561097223. The cubic root of 20553131 is about 273.9214215150.

Adding to 20553131 its reverse (13135502), we get a palindrome (33688633).

The spelling of 20553131 in words is "twenty million, five hundred fifty-three thousand, one hundred thirty-one".