20894687951 has 2 divisors, whose sum is σ = 20894687952. Its totient is φ = 20894687950.

The previous prime is 20894687911. The next prime is 20894687969. The reversal of 20894687951 is 15978649802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20894687951 - 2²² = 20890493647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20894687911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447343975 + 10447343976.

It is an arithmetic number, because the mean of its divisors is an integer number (10447343976).

Almost surely, 2^20894687951 is an apocalyptic number.

20894687951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894687951 is an equidigital number, since it uses as much as digits as its factorization.

20894687951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 20894687951 in words is "twenty billion, eight hundred ninety-four million, six hundred eighty-seven thousand, nine hundred fifty-one".