18920739 has 4 divisors (see below), whose sum is σ = 25227656. Its totient is φ = 12613824.

The previous prime is 18920701. The next prime is 18920747. The reversal of 18920739 is 93702981.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18920739 - 2¹² = 18916643 is a prime.

It is a super-2 number, since 2×18920739² = 715988728612242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18920697 and 18920706.

It is not an unprimeable number, because it can be changed into a prime (18920939) 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, 3153454 + ... + 3153459.

It is an arithmetic number, because the mean of its divisors is an integer number (6306914).

Almost surely, 2^18920739 is an apocalyptic number.

18920739 is a deficient number, since it is larger than the sum of its proper divisors (6306917).

18920739 is an equidigital number, since it uses as much as digits as its factorization.

18920739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306916.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 18920739 is about 4349.7975814973. The cubic root of 18920739 is about 266.4685947549.

The spelling of 18920739 in words is "eighteen million, nine hundred twenty thousand, seven hundred thirty-nine".