20079749 has 4 divisors (see below), whose sum is σ = 20160000. Its totient is φ = 19999500.

The previous prime is 20079743. The next prime is 20079757. The reversal of 20079749 is 94797002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20079749 - 2¹⁶ = 20014213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20079743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39749 + ... + 40250.

It is an arithmetic number, because the mean of its divisors is an integer number (5040000).

Almost surely, 2^20079749 is an apocalyptic number.

It is an amenable number.

20079749 is a deficient number, since it is larger than the sum of its proper divisors (80251).

20079749 is an equidigital number, since it uses as much as digits as its factorization.

20079749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80250.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20079749 is about 4481.0432936985. The cubic root of 20079749 is about 271.8020699967.

The spelling of 20079749 in words is "twenty million, seventy-nine thousand, seven hundred forty-nine".