20569740 has 48 divisors (see below), whose sum is σ = 59458560. Its totient is φ = 5307840.

The previous prime is 20569727. The next prime is 20569811. The reversal of 20569740 is 4796502.

20569740 = 1600² + 1601² + ... + 1607².

It is a super-2 number, since 2×20569740² = 846228407335200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3670 + ... + 7389.

It is an arithmetic number, because the mean of its divisors is an integer number (1238720).

Almost surely, 2^20569740 is an apocalyptic number.

20569740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20569740 is an abundant number, since it is smaller than the sum of its proper divisors (38888820).

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

20569740 is a wasteful number, since it uses less digits than its factorization.

20569740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102 (or 11100 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20569740 is about 4535.3875247877. The cubic root of 20569740 is about 273.9951870148.

The spelling of 20569740 in words is "twenty million, five hundred sixty-nine thousand, seven hundred forty".