20015957 has 8 divisors (see below), whose sum is σ = 22493184. Its totient is φ = 17672688.

The previous prime is 20015923. The next prime is 20015977. The reversal of 20015957 is 75951002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20015957 - 2⁶ = 20015893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015917) 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 7 ways as a sum of consecutive naturals, for example, 33173 + ... + 33770.

It is an arithmetic number, because the mean of its divisors is an integer number (2811648).

Almost surely, 2^20015957 is an apocalyptic number.

It is an amenable number.

20015957 is a deficient number, since it is larger than the sum of its proper divisors (2477227).

20015957 is a wasteful number, since it uses less digits than its factorization.

20015957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66979.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20015957 is about 4473.9196461269. The cubic root of 20015957 is about 271.5139324056.

Adding to 20015957 its reverse (75951002), we get a palindrome (95966959).

The spelling of 20015957 in words is "twenty million, fifteen thousand, nine hundred fifty-seven".