20577636428 has 6 divisors (see below), whose sum is σ = 36010863756. Its totient is φ = 10288818212.

The previous prime is 20577636377. The next prime is 20577636437. The reversal of 20577636428 is 82463677502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2572204550 + ... + 2572204557.

It is an arithmetic number, because the mean of its divisors is an integer number (6001810626).

Almost surely, 2^20577636428 is an apocalyptic number.

It is an amenable number.

20577636428 is a deficient number, since it is larger than the sum of its proper divisors (15433227328).

20577636428 is a wasteful number, since it uses less digits than its factorization.

20577636428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144409111 (or 5144409109 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 20577636428 in words is "twenty billion, five hundred seventy-seven million, six hundred thirty-six thousand, four hundred twenty-eight".