20387039957 has 8 divisors (see below), whose sum is σ = 21983458560. Its totient is φ = 18842963040.

The previous prime is 20387039947. The next prime is 20387039971. The reversal of 20387039957 is 75993078302.

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 20387039957 - 2³⁰ = 19313298133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20387039899 and 20387039908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387039947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13084613 + ... + 13086170.

It is an arithmetic number, because the mean of its divisors is an integer number (2747932320).

Almost surely, 2^20387039957 is an apocalyptic number.

It is an amenable number.

20387039957 is a deficient number, since it is larger than the sum of its proper divisors (1596418603).

20387039957 is a wasteful number, since it uses less digits than its factorization.

20387039957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26170843.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The spelling of 20387039957 in words is "twenty billion, three hundred eighty-seven million, thirty-nine thousand, nine hundred fifty-seven".