20425919 has 4 divisors (see below), whose sum is σ = 20713680. Its totient is φ = 20138160.

The previous prime is 20425897. The next prime is 20425927. The reversal of 20425919 is 91952402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91952402 = 2 ⋅45976201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20425919 is a prime.

It is a super-2 number, since 2×20425919² = 834436333989122, 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 (20425939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143774 + ... + 143915.

It is an arithmetic number, because the mean of its divisors is an integer number (5178420).

Almost surely, 2^20425919 is an apocalyptic number.

20425919 is a deficient number, since it is larger than the sum of its proper divisors (287761).

20425919 is an equidigital number, since it uses as much as digits as its factorization.

20425919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287760.

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

The square root of 20425919 is about 4519.5042869766. The cubic root of 20425919 is about 273.3551131102.

The spelling of 20425919 in words is "twenty million, four hundred twenty-five thousand, nine hundred nineteen".