20400934 has 8 divisors (see below), whose sum is σ = 30637728. Its totient is φ = 10188360.

The previous prime is 20400869. The next prime is 20400959. The reversal of 20400934 is 43900402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 3777 + ... + 7420.

It is an arithmetic number, because the mean of its divisors is an integer number (3829716).

Almost surely, 2^20400934 is an apocalyptic number.

20400934 is a deficient number, since it is larger than the sum of its proper divisors (10236794).

20400934 is a wasteful number, since it uses less digits than its factorization.

20400934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12110.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20400934 is about 4516.7393106089. The cubic root of 20400934 is about 273.2436115726.

The spelling of 20400934 in words is "twenty million, four hundred thousand, nine hundred thirty-four".