20424731 has 2 divisors, whose sum is σ = 20424732. Its totient is φ = 20424730.

The previous prime is 20424727. The next prime is 20424773. The reversal of 20424731 is 13742402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20424731 - 2² = 20424727 is a prime.

It is a super-2 number, since 2×20424731² = 834339272844722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20424697 and 20424706.

It is not a weakly prime, because it can be changed into another prime (20424721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212365 + 10212366.

It is an arithmetic number, because the mean of its divisors is an integer number (10212366).

Almost surely, 2^20424731 is an apocalyptic number.

20424731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424731 is an equidigital number, since it uses as much as digits as its factorization.

20424731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20424731 is about 4519.3728547222. The cubic root of 20424731 is about 273.3498134356.

The spelling of 20424731 in words is "twenty million, four hundred twenty-four thousand, seven hundred thirty-one".