20061564 has 48 divisors (see below), whose sum is σ = 50738688. Its totient is φ = 6144768.

The previous prime is 20061553. The next prime is 20061583. The reversal of 20061564 is 46516002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7629 + ... + 9915.

It is an arithmetic number, because the mean of its divisors is an integer number (1057056).

Almost surely, 2^20061564 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 20061564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25369344).

20061564 is an abundant number, since it is smaller than the sum of its proper divisors (30677124).

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

20061564 is a wasteful number, since it uses less digits than its factorization.

20061564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354 (or 2352 counting only the distinct ones).

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

The square root of 20061564 is about 4479.0137307224. The cubic root of 20061564 is about 271.7199937134.

Adding to 20061564 its reverse (46516002), we get a palindrome (66577566).

It can be divided in two parts, 2006 and 1564, that added together give a triangular number (3570 = T₈₄).

The spelling of 20061564 in words is "twenty million, sixty-one thousand, five hundred sixty-four".