20615051 has 2 divisors, whose sum is σ = 20615052. Its totient is φ = 20615050.

The previous prime is 20615047. The next prime is 20615053. The reversal of 20615051 is 15051602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20615051 - 2² = 20615047 is a prime.

It is a Sophie Germain prime.

Together with 20615053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20615053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307525 + 10307526.

It is an arithmetic number, because the mean of its divisors is an integer number (10307526).

Almost surely, 2^20615051 is an apocalyptic number.

20615051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20615051 is an equidigital number, since it uses as much as digits as its factorization.

20615051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20615051 is about 4540.3800501720. The cubic root of 20615051 is about 274.1962249009.

Adding to 20615051 its reverse (15051602), we get a palindrome (35666653).

The spelling of 20615051 in words is "twenty million, six hundred fifteen thousand, fifty-one".