20636507 has 2 divisors, whose sum is σ = 20636508. Its totient is φ = 20636506.

The previous prime is 20636503. The next prime is 20636509. The reversal of 20636507 is 70563602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20636507 - 2² = 20636503 is a prime.

It is a super-2 number, since 2×20636507² = 851730842322098, which contains 22 as substring.

Together with 20636509, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20636507.

It is not a weakly prime, because it can be changed into another prime (20636503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318253 + 10318254.

It is an arithmetic number, because the mean of its divisors is an integer number (10318254).

Almost surely, 2^20636507 is an apocalyptic number.

20636507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636507 is an equidigital number, since it uses as much as digits as its factorization.

20636507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20636507 is about 4542.7422334973. The cubic root of 20636507 is about 274.2913190845.

The spelling of 20636507 in words is "twenty million, six hundred thirty-six thousand, five hundred seven".