20378957 has 2 divisors, whose sum is σ = 20378958. Its totient is φ = 20378956.

The previous prime is 20378951. The next prime is 20378999. The reversal of 20378957 is 75987302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 2621161 = 4214^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 20378957 - 2¹⁶ = 20313421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20378951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189478 + 10189479.

It is an arithmetic number, because the mean of its divisors is an integer number (10189479).

Almost surely, 2^20378957 is an apocalyptic number.

It is an amenable number.

20378957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378957 is an equidigital number, since it uses as much as digits as its factorization.

20378957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 20378957 is about 4514.3058159589. The cubic root of 20378957 is about 273.1454586731.

The spelling of 20378957 in words is "twenty million, three hundred seventy-eight thousand, nine hundred fifty-seven".