20501699 has 2 divisors, whose sum is σ = 20501700. Its totient is φ = 20501698.

The previous prime is 20501653. The next prime is 20501731. The reversal of 20501699 is 99610502.

It is an a-pointer prime, because the next prime (20501731) can be obtained adding 20501699 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20501699 - 2²⁰ = 19453123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20500699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250849 + 10250850.

It is an arithmetic number, because the mean of its divisors is an integer number (10250850).

Almost surely, 2^20501699 is an apocalyptic number.

20501699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501699 is an equidigital number, since it uses as much as digits as its factorization.

20501699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 20501699 is about 4527.8801883442. The cubic root of 20501699 is about 273.6927443624.

The spelling of 20501699 in words is "twenty million, five hundred one thousand, six hundred ninety-nine".