20565888 has 96 divisors (see below), whose sum is σ = 63605160. Its totient is φ = 5870592.

The previous prime is 20565877. The next prime is 20565899. The reversal of 20565888 is 88856502.

It is an interprime number because it is at equal distance from previous prime (20565877) and next prime (20565899).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18270 + ... + 19362.

Almost surely, 2^20565888 is an apocalyptic number.

20565888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20565888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31802580).

20565888 is an abundant number, since it is smaller than the sum of its proper divisors (43039272).

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

20565888 is a wasteful number, since it uses less digits than its factorization.

20565888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 20565888 is about 4534.9628443902. The cubic root of 20565888 is about 273.9780826769.

The spelling of 20565888 in words is "twenty million, five hundred sixty-five thousand, eight hundred eighty-eight".