20492719 has 4 divisors (see below), whose sum is σ = 22069096. Its totient is φ = 18916344.

The previous prime is 20492711. The next prime is 20492729. The reversal of 20492719 is 91729402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20492719 - 2³ = 20492711 is a prime.

It is a super-2 number, since 2×20492719² = 839903064025922, 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 (20492711) 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, 788169 + ... + 788194.

It is an arithmetic number, because the mean of its divisors is an integer number (5517274).

Almost surely, 2^20492719 is an apocalyptic number.

20492719 is a deficient number, since it is larger than the sum of its proper divisors (1576377).

20492719 is a wasteful number, since it uses less digits than its factorization.

20492719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576376.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20492719 is about 4526.8884457207. Note that the first 3 decimals coincide. The cubic root of 20492719 is about 273.6527782475.

The spelling of 20492719 in words is "twenty million, four hundred ninety-two thousand, seven hundred nineteen".