20451007 has 2 divisors, whose sum is σ = 20451008. Its totient is φ = 20451006.

The previous prime is 20451001. The next prime is 20451029. The reversal of 20451007 is 70015402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20451007 - 2³ = 20450999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225503 + 10225504.

It is an arithmetic number, because the mean of its divisors is an integer number (10225504).

Almost surely, 2^20451007 is an apocalyptic number.

20451007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451007 is an equidigital number, since it uses as much as digits as its factorization.

20451007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20451007 is about 4522.2789608780. The cubic root of 20451007 is about 273.4669828585.

Adding to 20451007 its reverse (70015402), we get a palindrome (90466409).

The spelling of 20451007 in words is "twenty million, four hundred fifty-one thousand, seven".