20720319 has 8 divisors (see below), whose sum is σ = 27648432. Its totient is φ = 13802880.

The previous prime is 20720311. The next prime is 20720321. The reversal of 20720319 is 91302702.

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

It is not a de Polignac number, because 20720319 - 2³ = 20720311 is a prime.

It is a super-2 number, since 2×20720319² = 858663238923522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720311) 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, 5079 + ... + 8199.

It is an arithmetic number, because the mean of its divisors is an integer number (3456054).

Almost surely, 2^20720319 is an apocalyptic number.

20720319 is a deficient number, since it is larger than the sum of its proper divisors (6928113).

20720319 is a wasteful number, since it uses less digits than its factorization.

20720319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20720319 is about 4551.9577106999. The cubic root of 20720319 is about 274.6621481868.

The spelling of 20720319 in words is "twenty million, seven hundred twenty thousand, three hundred nineteen".