20814919 has 16 divisors (see below), whose sum is σ = 23003136. Its totient is φ = 18748800.

The previous prime is 20814917. The next prime is 20814923. The reversal of 20814919 is 91941802.

It is not a de Polignac number, because 20814919 - 2¹ = 20814917 is a prime.

It is a super-2 number, since 2×20814919² = 866521705953122, 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 (20814917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66774 + ... + 67084.

It is an arithmetic number, because the mean of its divisors is an integer number (1437696).

Almost surely, 2^20814919 is an apocalyptic number.

20814919 is a deficient number, since it is larger than the sum of its proper divisors (2188217).

20814919 is a wasteful number, since it uses less digits than its factorization.

20814919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 20814919 is about 4562.3370107873. The cubic root of 20814919 is about 275.0795097918.

The spelling of 20814919 in words is "twenty million, eight hundred fourteen thousand, nine hundred nineteen".