20634231 has 4 divisors (see below), whose sum is σ = 27512312. Its totient is φ = 13756152.

The previous prime is 20634221. The next prime is 20634241. The reversal of 20634231 is 13243602.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (20634221) and next prime (20634241).

It is not a de Polignac number, because 20634231 - 2¹⁷ = 20503159 is a prime.

It is a super-2 number, since 2×20634231² = 851542977922722, 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 = 20634198 and 20634207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20634221) 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, 3439036 + ... + 3439041.

It is an arithmetic number, because the mean of its divisors is an integer number (6878078).

Almost surely, 2^20634231 is an apocalyptic number.

20634231 is a deficient number, since it is larger than the sum of its proper divisors (6878081).

20634231 is an equidigital number, since it uses as much as digits as its factorization.

20634231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878080.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20634231 is about 4542.4917171086. The cubic root of 20634231 is about 274.2812348521.

Adding to 20634231 its reverse (13243602), we get a palindrome (33877833).

The spelling of 20634231 in words is "twenty million, six hundred thirty-four thousand, two hundred thirty-one".