20764342566 has 48 divisors (see below), whose sum is σ = 49670712000. Its totient is φ = 6216410160.

The previous prime is 20764342553. The next prime is 20764342567. The reversal of 20764342566 is 66524346702.

20764342566 is a `hidden beast` number, since 2 + 0 + 7 + 6 + 43 + 42 + 566 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764342567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 615316 + ... + 648183.

It is an arithmetic number, because the mean of its divisors is an integer number (1034806500).

Almost surely, 2^20764342566 is an apocalyptic number.

20764342566 is an abundant number, since it is smaller than the sum of its proper divisors (28906369434).

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

20764342566 is a wasteful number, since it uses less digits than its factorization.

20764342566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263601 (or 1263598 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 45.

The spelling of 20764342566 in words is "twenty billion, seven hundred sixty-four million, three hundred forty-two thousand, five hundred sixty-six".