20102840577 has 16 divisors (see below), whose sum is σ = 30149668160. Its totient is φ = 13401892260.

The previous prime is 20102840573. The next prime is 20102840633. The reversal of 20102840577 is 77504820102.

20102840577 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 2 + 84 + 0 + 577 = 666.

It is not a de Polignac number, because 20102840577 - 2² = 20102840573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102840573) 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, 4593799 + ... + 4598172.

It is an arithmetic number, because the mean of its divisors is an integer number (1884354260).

Almost surely, 2^20102840577 is an apocalyptic number.

20102840577 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20102840577 is a deficient number, since it is larger than the sum of its proper divisors (10046827583).

20102840577 is an frugal number, since it uses more digits than its factorization.

20102840577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191992 (or 9191974 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 20102840577 in words is "twenty billion, one hundred two million, eight hundred forty thousand, five hundred seventy-seven".