20116731 has 8 divisors (see below), whose sum is σ = 26843920. Its totient is φ = 13400352.

The previous prime is 20116727. The next prime is 20116739. The reversal of 20116731 is 13761102.

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

It is not a de Polignac number, because 20116731 - 2² = 20116727 is a prime.

It is a super-2 number, since 2×20116731² = 809365732252722, 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 = 20116698 and 20116707.

It is not an unprimeable number, because it can be changed into a prime (20116739) 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, 4065 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (3355490).

Almost surely, 2^20116731 is an apocalyptic number.

20116731 is a deficient number, since it is larger than the sum of its proper divisors (6727189).

20116731 is a wasteful number, since it uses less digits than its factorization.

20116731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20116731 is about 4485.1678898342. The cubic root of 20116731 is about 271.9688320328.

Adding to 20116731 its reverse (13761102), we get a palindrome (33877833).

The spelling of 20116731 in words is "twenty million, one hundred sixteen thousand, seven hundred thirty-one".