20783951 has 2 divisors, whose sum is σ = 20783952. Its totient is φ = 20783950.

The previous prime is 20783941. The next prime is 20783953. The reversal of 20783951 is 15938702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20783951 - 2⁶ = 20783887 is a prime.

Together with 20783953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20783953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391975 + 10391976.

It is an arithmetic number, because the mean of its divisors is an integer number (10391976).

Almost surely, 2^20783951 is an apocalyptic number.

20783951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20783951 is an equidigital number, since it uses as much as digits as its factorization.

20783951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20783951 is about 4558.9418728473. The cubic root of 20783951 is about 274.9430229065.

The spelling of 20783951 in words is "twenty million, seven hundred eighty-three thousand, nine hundred fifty-one".