20654864 has 20 divisors (see below), whose sum is σ = 42373404. Its totient is φ = 9719808.

The previous prime is 20654863. The next prime is 20654891. The reversal of 20654864 is 46845602.

It can be written as a sum of positive squares in 2 ways, for example, as 15272464 + 5382400 = 3908^2 + 2320^2 .

It is not an unprimeable number, because it can be changed into a prime (20654863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37697 + ... + 38240.

Almost surely, 2^20654864 is an apocalyptic number.

It is an amenable number.

20654864 is an abundant number, since it is smaller than the sum of its proper divisors (21718540).

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

20654864 is a wasteful number, since it uses less digits than its factorization.

20654864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75962 (or 75956 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 20654864 is about 4544.7622600088. The cubic root of 20654864 is about 274.3726260209.

The spelling of 20654864 in words is "twenty million, six hundred fifty-four thousand, eight hundred sixty-four".