20378951 has 2 divisors, whose sum is σ = 20378952. Its totient is φ = 20378950.

The previous prime is 20378933. The next prime is 20378957. The reversal of 20378951 is 15987302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20378951 - 2¹⁰ = 20377927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20378957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189475 + 10189476.

It is an arithmetic number, because the mean of its divisors is an integer number (10189476).

Almost surely, 2^20378951 is an apocalyptic number.

20378951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378951 is an equidigital number, since it uses as much as digits as its factorization.

20378951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20378951 is about 4514.3051514048. The cubic root of 20378951 is about 273.1454318664.

The spelling of 20378951 in words is "twenty million, three hundred seventy-eight thousand, nine hundred fifty-one".