20421954 has 24 divisors (see below), whose sum is σ = 50568960. Its totient is φ = 5834808.

The previous prime is 20421949. The next prime is 20421967. The reversal of 20421954 is 45912402.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80914 + ... + 81165.

It is an arithmetic number, because the mean of its divisors is an integer number (2107040).

Almost surely, 2^20421954 is an apocalyptic number.

20421954 is an abundant number, since it is smaller than the sum of its proper divisors (30147006).

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

20421954 is a wasteful number, since it uses less digits than its factorization.

20421954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162094 (or 162091 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20421954 is about 4519.0656113847. The cubic root of 20421954 is about 273.3374244215.

The spelling of 20421954 in words is "twenty million, four hundred twenty-one thousand, nine hundred fifty-four".