20631153 has 4 divisors (see below), whose sum is σ = 27508208. Its totient is φ = 13754100.

The previous prime is 20631139. The next prime is 20631157. The reversal of 20631153 is 35113602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20631153 - 2⁴ = 20631137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20631157) 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, 3438523 + ... + 3438528.

It is an arithmetic number, because the mean of its divisors is an integer number (6877052).

Almost surely, 2^20631153 is an apocalyptic number.

It is an amenable number.

20631153 is a deficient number, since it is larger than the sum of its proper divisors (6877055).

20631153 is an equidigital number, since it uses as much as digits as its factorization.

20631153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6877054.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20631153 is about 4542.1529036350. The cubic root of 20631153 is about 274.2675960332.

Adding to 20631153 its reverse (35113602), we get a palindrome (55744755).

The spelling of 20631153 in words is "twenty million, six hundred thirty-one thousand, one hundred fifty-three".