20992519 has 4 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 20756560.

The previous prime is 20992513. The next prime is 20992523. The reversal of 20992519 is 91529902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91529902 = 2 ⋅45764951.

It is a cyclic number.

It is not a de Polignac number, because 20992519 - 2⁹ = 20992007 is a prime.

It is a super-2 number, since 2×20992519² = 881371707930722, 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 (20992513) 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, 117847 + ... + 118024.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120).

Almost surely, 2^20992519 is an apocalyptic number.

20992519 is a deficient number, since it is larger than the sum of its proper divisors (235961).

20992519 is an equidigital number, since it uses as much as digits as its factorization.

20992519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235960.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 20992519 is about 4581.7593782302. The cubic root of 20992519 is about 275.8596526173.

The spelling of 20992519 in words is "twenty million, nine hundred ninety-two thousand, five hundred nineteen".