20400038 has 8 divisors (see below), whose sum is σ = 30709800. Its totient is φ = 10163440.

The previous prime is 20400031. The next prime is 20400049. The reversal of 20400038 is 83000402.

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

It is a junction number, because it is equal to n+sod(n) for n = 20399989 and 20400025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17588 + ... + 18711.

It is an arithmetic number, because the mean of its divisors is an integer number (3838725).

Almost surely, 2^20400038 is an apocalyptic number.

20400038 is a deficient number, since it is larger than the sum of its proper divisors (10309762).

20400038 is a wasteful number, since it uses less digits than its factorization.

20400038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36582.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20400038 is about 4516.6401229232. The cubic root of 20400038 is about 273.2396112678.

The spelling of 20400038 in words is "twenty million, four hundred thousand, thirty-eight".