20495731 has 2 divisors, whose sum is σ = 20495732. Its totient is φ = 20495730.

The previous prime is 20495719. The next prime is 20495749. The reversal of 20495731 is 13759402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20495731 is a prime.

It is a super-2 number, since 2×20495731² = 840149978448722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20495693 and 20495702.

It is not a weakly prime, because it can be changed into another prime (20495701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247865 + 10247866.

It is an arithmetic number, because the mean of its divisors is an integer number (10247866).

Almost surely, 2^20495731 is an apocalyptic number.

20495731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20495731 is an equidigital number, since it uses as much as digits as its factorization.

20495731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20495731 is about 4527.2211123381. The cubic root of 20495731 is about 273.6661846641. Note that the first 3 decimals are identical.

The spelling of 20495731 in words is "twenty million, four hundred ninety-five thousand, seven hundred thirty-one".