20007789190957 has 4 divisors (see below), whose sum is σ = 20653201745536. Its totient is φ = 19362376636380.

The previous prime is 20007789190933. The next prime is 20007789190979. The reversal of 20007789190957 is 75909198770002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20007789190957 - 2¹⁹ = 20007788666669 is a prime.

It is a super-2 number, since 2×20007789190957² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007789110957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322706277243 + ... + 322706277304.

It is an arithmetic number, because the mean of its divisors is an integer number (5163300436384).

Almost surely, 2^{20007789190957} is an apocalyptic number.

It is an amenable number.

20007789190957 is a deficient number, since it is larger than the sum of its proper divisors (645412554579).

20007789190957 is an equidigital number, since it uses as much as digits as its factorization.

20007789190957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645412554578.

The product of its (nonzero) digits is 20003760, while the sum is 64.

The spelling of 20007789190957 in words is "twenty trillion, seven billion, seven hundred eighty-nine million, one hundred ninety thousand, nine hundred fifty-seven".