20766212556 has 48 divisors (see below), whose sum is σ = 50363733504. Its totient is φ = 6653831616.

The previous prime is 20766212531. The next prime is 20766212563. The reversal of 20766212556 is 65521266702.

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, 244900 + ... + 318603.

It is an arithmetic number, because the mean of its divisors is an integer number (1049244448).

Almost surely, 2^20766212556 is an apocalyptic number.

It is an amenable number.

20766212556 is an abundant number, since it is smaller than the sum of its proper divisors (29597520948).

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

20766212556 is a wasteful number, since it uses less digits than its factorization.

20766212556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563630 (or 563628 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 20766212556 in words is "twenty billion, seven hundred sixty-six million, two hundred twelve thousand, five hundred fifty-six".