20051739 has 8 divisors (see below), whose sum is σ = 29706320. Its totient is φ = 13367808.

The previous prime is 20051729. The next prime is 20051767. The reversal of 20051739 is 93715002.

It is not a de Polignac number, because 20051739 - 2¹⁹ = 19527451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 742657 = 20051739 / (2 + 0 + 0 + 5 + 1 + 7 + 3 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051729) 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, 371302 + ... + 371355.

It is an arithmetic number, because the mean of its divisors is an integer number (3713290).

Almost surely, 2^20051739 is an apocalyptic number.

20051739 is a deficient number, since it is larger than the sum of its proper divisors (9654581).

20051739 is an equidigital number, since it uses as much as digits as its factorization.

20051739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742666 (or 742660 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20051739 is about 4477.9168147700. The cubic root of 20051739 is about 271.6756288628.

The spelling of 20051739 in words is "twenty million, fifty-one thousand, seven hundred thirty-nine".