20749737 has 8 divisors (see below), whose sum is σ = 27836704. Its totient is φ = 13747968.

The previous prime is 20749721. The next prime is 20749747. The reversal of 20749737 is 73794702.

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

It is not a de Polignac number, because 20749737 - 2⁴ = 20749721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20749695 and 20749704.

It is not an unprimeable number, because it can be changed into a prime (20749747) 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, 20728 + ... + 21705.

It is an arithmetic number, because the mean of its divisors is an integer number (3479588).

Almost surely, 2^20749737 is an apocalyptic number.

It is an amenable number.

20749737 is a deficient number, since it is larger than the sum of its proper divisors (7086967).

20749737 is a wasteful number, since it uses less digits than its factorization.

20749737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42599.

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 20749737 is about 4555.1879214803. The cubic root of 20749737 is about 274.7920720260.

It can be divided in two parts, 2074 and 9737, that added together give a palindrome (11811).

The spelling of 20749737 in words is "twenty million, seven hundred forty-nine thousand, seven hundred thirty-seven".