20791699 has 2 divisors, whose sum is σ = 20791700. Its totient is φ = 20791698.

The previous prime is 20791691. The next prime is 20791703. The reversal of 20791699 is 99619702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20791699 - 2³ = 20791691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20791691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10395849 + 10395850.

It is an arithmetic number, because the mean of its divisors is an integer number (10395850).

Almost surely, 2^20791699 is an apocalyptic number.

20791699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20791699 is an equidigital number, since it uses as much as digits as its factorization.

20791699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 20791699 is about 4559.7915522532. The cubic root of 20791699 is about 274.9771837820.

The spelling of 20791699 in words is "twenty million, seven hundred ninety-one thousand, six hundred ninety-nine".