20954719 has 4 divisors (see below), whose sum is σ = 21267544. Its totient is φ = 20641896.

The previous prime is 20954711. The next prime is 20954737. The reversal of 20954719 is 91745902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91745902 = 2 ⋅45872951.

It is not a de Polignac number, because 20954719 - 2³ = 20954711 is a prime.

It is a super-2 number, since 2×20954719² = 878200496737922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20954711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156312 + ... + 156445.

It is an arithmetic number, because the mean of its divisors is an integer number (5316886).

Almost surely, 2^20954719 is an apocalyptic number.

20954719 is a deficient number, since it is larger than the sum of its proper divisors (312825).

20954719 is an equidigital number, since it uses as much as digits as its factorization.

20954719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312824.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20954719 is about 4577.6324666797. The cubic root of 20954719 is about 275.6939783619.

The spelling of 20954719 in words is "twenty million, nine hundred fifty-four thousand, seven hundred nineteen".