20569998 has 16 divisors (see below), whose sum is σ = 41184720. Its totient is φ = 6849216.

The previous prime is 20569933. The next prime is 20569999. The reversal of 20569998 is 89996502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20569999) 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, 8908 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (2574045).

Almost surely, 2^20569998 is an apocalyptic number.

20569998 is an abundant number, since it is smaller than the sum of its proper divisors (20614722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20569998 is a wasteful number, since it uses less digits than its factorization.

20569998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 20569998 is about 4535.4159676925. The cubic root of 20569998 is about 273.9963325561.

The spelling of 20569998 in words is "twenty million, five hundred sixty-nine thousand, nine hundred ninety-eight".