20611456 has 32 divisors (see below), whose sum is σ = 41279400. Its totient is φ = 10251264.

The previous prime is 20611441. The next prime is 20611457. The reversal of 20611456 is 65411602.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20611456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20611457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35940 + ... + 36508.

Almost surely, 2^20611456 is an apocalyptic number.

It is an amenable number.

20611456 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20611456 is an equidigital number, since it uses as much as digits as its factorization.

20611456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20611456 is about 4539.9841409415. The cubic root of 20611456 is about 274.1802852082.

The spelling of 20611456 in words is "twenty million, six hundred eleven thousand, four hundred fifty-six".