20454656 has 18 divisors (see below), whose sum is σ = 40829922. Its totient is φ = 10227200.

The previous prime is 20454653. The next prime is 20454671. The reversal of 20454656 is 65645402.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 4326400 = 4016^2 + 2080^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39695 + ... + 40206.

It is an arithmetic number, because the mean of its divisors is an integer number (2268329).

Almost surely, 2^20454656 is an apocalyptic number.

It is an amenable number.

20454656 is a deficient number, since it is larger than the sum of its proper divisors (20375266).

20454656 is an frugal number, since it uses more digits than its factorization.

20454656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79917 (or 79903 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20454656 is about 4522.6823899098. The cubic root of 20454656 is about 273.4832464697.

The spelling of 20454656 in words is "twenty million, four hundred fifty-four thousand, six hundred fifty-six".