20072739 has 8 divisors (see below), whose sum is σ = 27416592. Its totient is φ = 13055360.

The previous prime is 20072729. The next prime is 20072747. The reversal of 20072739 is 93727002.

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 20072739 - 2⁵ = 20072707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20072729) 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, 81474 + ... + 81719.

It is an arithmetic number, because the mean of its divisors is an integer number (3427074).

Almost surely, 2^20072739 is an apocalyptic number.

20072739 is a deficient number, since it is larger than the sum of its proper divisors (7343853).

20072739 is a wasteful number, since it uses less digits than its factorization.

20072739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163237.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 20072739 is about 4480.2610415019. The cubic root of 20072739 is about 271.7704368942.

The spelling of 20072739 in words is "twenty million, seventy-two thousand, seven hundred thirty-nine".