20603831 has 4 divisors (see below), whose sum is σ = 20752200. Its totient is φ = 20455464.

The previous prime is 20603827. The next prime is 20603839. The reversal of 20603831 is 13830602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20603831 - 2² = 20603827 is a prime.

It is a super-2 number, since 2×20603831² = 849035703753122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20603797 and 20603806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603839) 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, 73976 + ... + 74253.

It is an arithmetic number, because the mean of its divisors is an integer number (5188050).

Almost surely, 2^20603831 is an apocalyptic number.

20603831 is a deficient number, since it is larger than the sum of its proper divisors (148369).

20603831 is a wasteful number, since it uses less digits than its factorization.

20603831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148368.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20603831 is about 4539.1443026192. The cubic root of 20603831 is about 274.1464709622.

The spelling of 20603831 in words is "twenty million, six hundred three thousand, eight hundred thirty-one".