20974819 has 8 divisors (see below), whose sum is σ = 21865808. Its totient is φ = 20100960.

The previous prime is 20974813. The next prime is 20974829. The reversal of 20974819 is 91847902.

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 20974819 - 2⁷ = 20974691 is a prime.

It is a super-2 number, since 2×20974819² = 879886064165522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20974813) 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, 1752 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (2733226).

Almost surely, 2^20974819 is an apocalyptic number.

20974819 is a deficient number, since it is larger than the sum of its proper divisors (890989).

20974819 is an equidigital number, since it uses as much as digits as its factorization.

20974819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8565.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20974819 is about 4579.8273984944. The cubic root of 20974819 is about 275.7820997711.

The spelling of 20974819 in words is "twenty million, nine hundred seventy-four thousand, eight hundred nineteen".