20521368 has 96 divisors (see below), whose sum is σ = 66892800. Its totient is φ = 5552064.

The previous prime is 20521339. The next prime is 20521373. The reversal of 20521368 is 86312502.

It is a super-2 number, since 2×20521368² = 842253089182848, 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 23 ways as a sum of consecutive naturals, for example, 8505 + ... + 10647.

It is an arithmetic number, because the mean of its divisors is an integer number (696800).

Almost surely, 2^20521368 is an apocalyptic number.

20521368 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 20521368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33446400).

20521368 is an abundant number, since it is smaller than the sum of its proper divisors (46371432).

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

20521368 is a wasteful number, since it uses less digits than its factorization.

20521368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20521368 is about 4530.0516553346. The cubic root of 20521368 is about 273.7802418582.

The spelling of 20521368 in words is "twenty million, five hundred twenty-one thousand, three hundred sixty-eight".