20120855077 has 2 divisors, whose sum is σ = 20120855078. Its totient is φ = 20120855076.

The previous prime is 20120855059. The next prime is 20120855143. The reversal of 20120855077 is 77055802102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18142473636 + 1978381441 = 134694^2 + 44479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120855077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120865077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060427538 + 10060427539.

It is an arithmetic number, because the mean of its divisors is an integer number (10060427539).

Almost surely, 2^20120855077 is an apocalyptic number.

It is an amenable number.

20120855077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120855077 is an equidigital number, since it uses as much as digits as its factorization.

20120855077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 20120855077 in words is "twenty billion, one hundred twenty million, eight hundred fifty-five thousand, seventy-seven".