20452919 has 4 divisors (see below), whose sum is σ = 20488944. Its totient is φ = 20416896.

The previous prime is 20452879. The next prime is 20452931. The reversal of 20452919 is 91925402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91925402 = 2 ⋅45962701.

It is a cyclic number.

It is not a de Polignac number, because 20452919 - 2¹⁶ = 20387383 is a prime.

It is a super-2 number, since 2×20452919² = 836643791241122, 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 (20452979) 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, 17147 + ... + 18300.

It is an arithmetic number, because the mean of its divisors is an integer number (5122236).

Almost surely, 2^20452919 is an apocalyptic number.

20452919 is a deficient number, since it is larger than the sum of its proper divisors (36025).

20452919 is an equidigital number, since it uses as much as digits as its factorization.

20452919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36024.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20452919 is about 4522.4903537763. The cubic root of 20452919 is about 273.4755048933.

The spelling of 20452919 in words is "twenty million, four hundred fifty-two thousand, nine hundred nineteen".