20328532977 has 4 divisors (see below), whose sum is σ = 27104710640. Its totient is φ = 13552355316.

The previous prime is 20328532967. The next prime is 20328533009. The reversal of 20328532977 is 77923582302.

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 not a de Polignac number, because 20328532977 - 2⁷ = 20328532849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20328532907) 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, 3388088827 + ... + 3388088832.

It is an arithmetic number, because the mean of its divisors is an integer number (6776177660).

Almost surely, 2^20328532977 is an apocalyptic number.

It is an amenable number.

20328532977 is a deficient number, since it is larger than the sum of its proper divisors (6776177663).

20328532977 is an equidigital number, since it uses as much as digits as its factorization.

20328532977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776177662.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 20328532977 in words is "twenty billion, three hundred twenty-eight million, five hundred thirty-two thousand, nine hundred seventy-seven".