20254643 has 2 divisors, whose sum is σ = 20254644. Its totient is φ = 20254642.

The previous prime is 20254631. The next prime is 20254649. The reversal of 20254643 is 34645202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20254643 - 2¹⁶ = 20189107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20254649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127321 + 10127322.

It is an arithmetic number, because the mean of its divisors is an integer number (10127322).

Almost surely, 2^20254643 is an apocalyptic number.

20254643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20254643 is an equidigital number, since it uses as much as digits as its factorization.

20254643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20254643 is about 4500.5158593210. The cubic root of 20254643 is about 272.5889191623.

Adding to 20254643 its reverse (34645202), we get a palindrome (54899845).

It can be divided in two parts, 202 and 54643, that added together give a palindrome (54845).

The spelling of 20254643 in words is "twenty million, two hundred fifty-four thousand, six hundred forty-three".