20792987 has 2 divisors, whose sum is σ = 20792988. Its totient is φ = 20792986.

The previous prime is 20792983. The next prime is 20793007. The reversal of 20792987 is 78929702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20792987 - 2² = 20792983 is a prime.

It is not a weakly prime, because it can be changed into another prime (20792983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10396493 + 10396494.

It is an arithmetic number, because the mean of its divisors is an integer number (10396494).

Almost surely, 2^20792987 is an apocalyptic number.

20792987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20792987 is an equidigital number, since it uses as much as digits as its factorization.

20792987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20792987 is about 4559.9327845923. The cubic root of 20792987 is about 274.9828617419.

The spelling of 20792987 in words is "twenty million, seven hundred ninety-two thousand, nine hundred eighty-seven".