20545652780 has 48 divisors (see below), whose sum is σ = 43949103744. Its totient is φ = 8065854720.

The previous prime is 20545652779. The next prime is 20545652837. The reversal of 20545652780 is 8725654502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546674 + ... + 583046.

It is an arithmetic number, because the mean of its divisors is an integer number (915606328).

Almost surely, 2^20545652780 is an apocalyptic number.

20545652780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20545652780 is an abundant number, since it is smaller than the sum of its proper divisors (23403450964).

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

20545652780 is a wasteful number, since it uses less digits than its factorization.

20545652780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36906 (or 36904 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 44.

The spelling of 20545652780 in words is "twenty billion, five hundred forty-five million, six hundred fifty-two thousand, seven hundred eighty".