20569340 has 24 divisors (see below), whose sum is σ = 47122992. Its totient is φ = 7479680.

The previous prime is 20569327. The next prime is 20569349. The reversal of 20569340 is 4396502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20569349) 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, 46529 + ... + 46968.

It is an arithmetic number, because the mean of its divisors is an integer number (1963458).

Almost surely, 2^20569340 is an apocalyptic number.

20569340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20569340 is an abundant number, since it is smaller than the sum of its proper divisors (26553652).

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

20569340 is a wasteful number, since it uses less digits than its factorization.

20569340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93517 (or 93515 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20569340 is about 4535.3434269083. The cubic root of 20569340 is about 273.9934109627.

The spelling of 20569340 in words is "twenty million, five hundred sixty-nine thousand, three hundred forty".