20177774148 has 48 divisors (see below), whose sum is σ = 54719400960. Its totient is φ = 5667363744.

The previous prime is 20177774143. The next prime is 20177774159. The reversal of 20177774148 is 84147777102.

It is a junction number, because it is equal to n+sod(n) for n = 20177774097 and 20177774106.

It is not an unprimeable number, because it can be changed into a prime (20177774143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2030736 + ... + 2040647.

It is an arithmetic number, because the mean of its divisors is an integer number (1139987520).

Almost surely, 2^20177774148 is an apocalyptic number.

20177774148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20177774148 is an abundant number, since it is smaller than the sum of its proper divisors (34541626812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20177774148 is a wasteful number, since it uses less digits than its factorization.

20177774148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071456 (or 4071454 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 48.

The spelling of 20177774148 in words is "twenty billion, one hundred seventy-seven million, seven hundred seventy-four thousand, one hundred forty-eight".