20655424 has 56 divisors (see below), whose sum is σ = 43891200. Its totient is φ = 9623040.

The previous prime is 20655379. The next prime is 20655433. The reversal of 20655424 is 42455602.

20655424 = T₁₁₇₉ + T₁₁₈₀ + ... + T₁₂₀₇.

It is a junction number, because it is equal to n+sod(n) for n = 20655392 and 20655401.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57357 + ... + 57715.

Almost surely, 2^20655424 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 20655424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21945600).

20655424 is an abundant number, since it is smaller than the sum of its proper divisors (23235776).

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

20655424 is a wasteful number, since it uses less digits than its factorization.

20655424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 20655424 is about 4544.8238689745. The cubic root of 20655424 is about 274.3751056190.

The spelling of 20655424 in words is "twenty million, six hundred fifty-five thousand, four hundred twenty-four".