20972019 has 4 divisors (see below), whose sum is σ = 27962696. Its totient is φ = 13981344.

The previous prime is 20971997. The next prime is 20972023. The reversal of 20972019 is 91027902.

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

It is not a de Polignac number, because 20972019 - 2⁵ = 20971987 is a prime.

It is a super-2 number, since 2×20972019² = 879651161872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972059) 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, 3495334 + ... + 3495339.

It is an arithmetic number, because the mean of its divisors is an integer number (6990674).

Almost surely, 2^20972019 is an apocalyptic number.

20972019 is a deficient number, since it is larger than the sum of its proper divisors (6990677).

20972019 is an equidigital number, since it uses as much as digits as its factorization.

20972019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990676.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20972019 is about 4579.5216999158. The cubic root of 20972019 is about 275.7698275278.

The spelling of 20972019 in words is "twenty million, nine hundred seventy-two thousand, nineteen".