20506577 has 8 divisors (see below), whose sum is σ = 25238976. Its totient is φ = 16224912.

The previous prime is 20506543. The next prime is 20506597. The reversal of 20506577 is 77560502.

It is a happy number.

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 20506577 - 2⁶ = 20506513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20506517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112583 + ... + 112764.

It is an arithmetic number, because the mean of its divisors is an integer number (3154872).

Almost surely, 2^20506577 is an apocalyptic number.

It is an amenable number.

20506577 is a deficient number, since it is larger than the sum of its proper divisors (4732399).

20506577 is a wasteful number, since it uses less digits than its factorization.

20506577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225367.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20506577 is about 4528.4188189698. The cubic root of 20506577 is about 273.7144493495.

The spelling of 20506577 in words is "twenty million, five hundred six thousand, five hundred seventy-seven".