20407031 has 2 divisors, whose sum is σ = 20407032. Its totient is φ = 20407030.

The previous prime is 20407019. The next prime is 20407099. The reversal of 20407031 is 13070402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20407031 is a prime.

It is a super-2 number, since 2×20407031² = 832893828469922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20407631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203515 + 10203516.

It is an arithmetic number, because the mean of its divisors is an integer number (10203516).

Almost surely, 2^20407031 is an apocalyptic number.

20407031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20407031 is an equidigital number, since it uses as much as digits as its factorization.

20407031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20407031 is about 4517.4141939831. The cubic root of 20407031 is about 273.2708292866.

Adding to 20407031 its reverse (13070402), we get a palindrome (33477433).

The spelling of 20407031 in words is "twenty million, four hundred seven thousand, thirty-one".