20319957 has 24 divisors (see below), whose sum is σ = 35020800. Its totient is φ = 11610648.

The previous prime is 20319931. The next prime is 20319989. The reversal of 20319957 is 75991302.

It is not a de Polignac number, because 20319957 - 2⁸ = 20319701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20319907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6357 + ... + 9002.

It is an arithmetic number, because the mean of its divisors is an integer number (1459200).

Almost surely, 2^20319957 is an apocalyptic number.

20319957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20319957 is a deficient number, since it is larger than the sum of its proper divisors (14700843).

20319957 is a wasteful number, since it uses less digits than its factorization.

20319957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15382 (or 15369 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 20319957 is about 4507.7662982901. The cubic root of 20319957 is about 272.8816054669.

The spelling of 20319957 in words is "twenty million, three hundred nineteen thousand, nine hundred fifty-seven".