20425540609 has 8 divisors (see below), whose sum is σ = 21320338752. Its totient is φ = 19531303440.

The previous prime is 20425540601. The next prime is 20425540649. The reversal of 20425540609 is 90604552402.

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

It is a cyclic number.

It is not a de Polignac number, because 20425540609 - 2³ = 20425540601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425540601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64962 + ... + 212299.

It is an arithmetic number, because the mean of its divisors is an integer number (2665042344).

Almost surely, 2^20425540609 is an apocalyptic number.

It is an amenable number.

20425540609 is a deficient number, since it is larger than the sum of its proper divisors (894798143).

20425540609 is a wasteful number, since it uses less digits than its factorization.

20425540609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280487.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20425540609 in words is "twenty billion, four hundred twenty-five million, five hundred forty thousand, six hundred nine".