20532731 has 2 divisors, whose sum is σ = 20532732. Its totient is φ = 20532730.

The previous prime is 20532727. The next prime is 20532737. The reversal of 20532731 is 13723502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20532731 - 2² = 20532727 is a prime.

It is a super-2 number, since 2×20532731² = 843186084636722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20532697 and 20532706.

It is not a weakly prime, because it can be changed into another prime (20532737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266365 + 10266366.

It is an arithmetic number, because the mean of its divisors is an integer number (10266366).

Almost surely, 2^20532731 is an apocalyptic number.

20532731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20532731 is an equidigital number, since it uses as much as digits as its factorization.

20532731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20532731 is about 4531.3056617271. The cubic root of 20532731 is about 273.8307646575.

The spelling of 20532731 in words is "twenty million, five hundred thirty-two thousand, seven hundred thirty-one".