20936739 has 8 divisors (see below), whose sum is σ = 29129472. Its totient is φ = 13350920.

The previous prime is 20936737. The next prime is 20936759. The reversal of 20936739 is 93763902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20936739 - 2¹ = 20936737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20936697 and 20936706.

It is not an unprimeable number, because it can be changed into a prime (20936737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151647 + ... + 151784.

It is an arithmetic number, because the mean of its divisors is an integer number (3641184).

Almost surely, 2^20936739 is an apocalyptic number.

20936739 is a deficient number, since it is larger than the sum of its proper divisors (8192733).

20936739 is a wasteful number, since it uses less digits than its factorization.

20936739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303457.

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 20936739 is about 4575.6681479321. The cubic root of 20936739 is about 275.6151035880.

The spelling of 20936739 in words is "twenty million, nine hundred thirty-six thousand, seven hundred thirty-nine".