20700737 has 2 divisors, whose sum is σ = 20700738. Its totient is φ = 20700736.

The previous prime is 20700733. The next prime is 20700739. The reversal of 20700737 is 73700702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13512976 + 7187761 = 3676^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 20700737 - 2² = 20700733 is a prime.

Together with 20700739, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20700733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350368 + 10350369.

It is an arithmetic number, because the mean of its divisors is an integer number (10350369).

Almost surely, 2^20700737 is an apocalyptic number.

It is an amenable number.

20700737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700737 is an equidigital number, since it uses as much as digits as its factorization.

20700737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2058, while the sum is 26.

The square root of 20700737 is about 4549.8062596115. The cubic root of 20700737 is about 274.5755966012.

The spelling of 20700737 in words is "twenty million, seven hundred thousand, seven hundred thirty-seven".