20675731 has 8 divisors (see below), whose sum is σ = 21062864. Its totient is φ = 20291040.

The previous prime is 20675719. The next prime is 20675737. The reversal of 20675731 is 13757602.

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 20675731 - 2¹⁷ = 20544659 is a prime.

It is a super-2 number, since 2×20675731² = 854971704768722, 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 = 20675693 and 20675702.

It is not an unprimeable number, because it can be changed into a prime (20675737) 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, 27841 + ... + 28573.

It is an arithmetic number, because the mean of its divisors is an integer number (2632858).

Almost surely, 2^20675731 is an apocalyptic number.

20675731 is a deficient number, since it is larger than the sum of its proper divisors (387133).

20675731 is an equidigital number, since it uses as much as digits as its factorization.

20675731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20675731 is about 4547.0574001215. The cubic root of 20675731 is about 274.4649917807.

The spelling of 20675731 in words is "twenty million, six hundred seventy-five thousand, seven hundred thirty-one".