20641351 has 2 divisors, whose sum is σ = 20641352. Its totient is φ = 20641350.

The previous prime is 20641343. The next prime is 20641393. The reversal of 20641351 is 15314602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20641351 - 2³ = 20641343 is a prime.

It is a super-2 number, since 2×20641351² = 852130742210402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20642351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320675 + 10320676.

It is an arithmetic number, because the mean of its divisors is an integer number (10320676).

Almost surely, 2^20641351 is an apocalyptic number.

20641351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641351 is an equidigital number, since it uses as much as digits as its factorization.

20641351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20641351 is about 4543.2753603540. The cubic root of 20641351 is about 274.3127788403.

Adding to 20641351 its reverse (15314602), we get a palindrome (35955953).

The spelling of 20641351 in words is "twenty million, six hundred forty-one thousand, three hundred fifty-one".