20533688 has 32 divisors (see below), whose sum is σ = 46591200. Its totient is φ = 8282112.

The previous prime is 20533679. The next prime is 20533693. The reversal of 20533688 is 88633502.

It is a super-4 number, since 4×20533688⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9833 + ... + 11736.

It is an arithmetic number, because the mean of its divisors is an integer number (1455975).

Almost surely, 2^20533688 is an apocalyptic number.

20533688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20533688 is an abundant number, since it is smaller than the sum of its proper divisors (26057512).

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

20533688 is a wasteful number, since it uses less digits than its factorization.

20533688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21599 (or 21595 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20533688 is about 4531.4112591995. The cubic root of 20533688 is about 273.8350188727.

The spelling of 20533688 in words is "twenty million, five hundred thirty-three thousand, six hundred eighty-eight".