20425745 has 8 divisors (see below), whose sum is σ = 25301760. Its totient is φ = 15813360.

The previous prime is 20425729. The next prime is 20425759. The reversal of 20425745 is 54752402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20425745 - 2⁴ = 20425729 is a prime.

It is a super-2 number, since 2×20425745² = 834422117610050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65735 + ... + 66044.

It is an arithmetic number, because the mean of its divisors is an integer number (3162720).

Almost surely, 2^20425745 is an apocalyptic number.

It is an amenable number.

20425745 is a deficient number, since it is larger than the sum of its proper divisors (4876015).

20425745 is a wasteful number, since it uses less digits than its factorization.

20425745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131815.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20425745 is about 4519.4850370369. The cubic root of 20425745 is about 273.3543369080.

The spelling of 20425745 in words is "twenty million, four hundred twenty-five thousand, seven hundred forty-five".