20564016 has 160 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 5591040.

The previous prime is 20563981. The next prime is 20564021. The reversal of 20564016 is 61046502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260265 + ... + 260343.

It is an arithmetic number, because the mean of its divisors is an integer number (401760).

Almost surely, 2^20564016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20564016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

20564016 is an abundant number, since it is smaller than the sum of its proper divisors (43717584).

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

20564016 is a wasteful number, since it uses less digits than its factorization.

20564016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20564016 is about 4534.7564432944. The cubic root of 20564016 is about 273.9697695172.

The spelling of 20564016 in words is "twenty million, five hundred sixty-four thousand, sixteen".