20912351 has 2 divisors, whose sum is σ = 20912352. Its totient is φ = 20912350.

The previous prime is 20912341. The next prime is 20912377. The reversal of 20912351 is 15321902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20912351 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20912341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456175 + 10456176.

It is an arithmetic number, because the mean of its divisors is an integer number (10456176).

Almost surely, 2^20912351 is an apocalyptic number.

20912351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912351 is an equidigital number, since it uses as much as digits as its factorization.

20912351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20912351 is about 4573.0024054225. The cubic root of 20912351 is about 275.5080459616.

The spelling of 20912351 in words is "twenty million, nine hundred twelve thousand, three hundred fifty-one".