20543516 has 12 divisors (see below), whose sum is σ = 41087088. Its totient is φ = 8804352.

The previous prime is 20543477. The next prime is 20543527. The reversal of 20543516 is 61534502.

20543516 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366821 + ... + 366876.

It is an arithmetic number, because the mean of its divisors is an integer number (3423924).

Almost surely, 2^20543516 is an apocalyptic number.

It is an amenable number.

20543516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20543516 is a wasteful number, since it uses less digits than its factorization.

20543516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733708 (or 733706 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20543516 is about 4532.4955598434. The cubic root of 20543516 is about 273.8787002823.

The spelling of 20543516 in words is "twenty million, five hundred forty-three thousand, five hundred sixteen".