20635420 has 24 divisors (see below), whose sum is σ = 46668384. Its totient is φ = 7619136.

The previous prime is 20635409. The next prime is 20635441. The reversal of 20635420 is 2453602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20635391 and 20635400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39424 + ... + 39943.

It is an arithmetic number, because the mean of its divisors is an integer number (1944516).

Almost surely, 2^20635420 is an apocalyptic number.

20635420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20635420 is an abundant number, since it is smaller than the sum of its proper divisors (26032964).

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

20635420 is a wasteful number, since it uses less digits than its factorization.

20635420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79389 (or 79387 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20635420 is about 4542.6225905307. The cubic root of 20635420 is about 274.2865030256.

The spelling of 20635420 in words is "twenty million, six hundred thirty-five thousand, four hundred twenty".