20206931 has 8 divisors (see below), whose sum is σ = 21654864. Its totient is φ = 18787840.

The previous prime is 20206909. The next prime is 20206951. The reversal of 20206931 is 13960202.

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

It is a cyclic number.

It is not a de Polignac number, because 20206931 - 2⁶ = 20206867 is a prime.

It is a super-2 number, since 2×20206931² = 816640120877522, 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 = 20206897 and 20206906.

It is not an unprimeable number, because it can be changed into a prime (20206951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5750 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (2706858).

Almost surely, 2^20206931 is an apocalyptic number.

20206931 is a deficient number, since it is larger than the sum of its proper divisors (1447933).

20206931 is a wasteful number, since it uses less digits than its factorization.

20206931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14421.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20206931 is about 4495.2120083484. The cubic root of 20206931 is about 272.3747133288.

The spelling of 20206931 in words is "twenty million, two hundred six thousand, nine hundred thirty-one".