20666451510 has 64 divisors (see below), whose sum is σ = 57506664960. Its totient is φ = 5271441120.

The previous prime is 20666451499. The next prime is 20666451521. The reversal of 20666451510 is 1515466602.

It is an interprime number because it is at equal distance from previous prime (20666451499) and next prime (20666451521).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1657756 + ... + 1670175.

It is an arithmetic number, because the mean of its divisors is an integer number (898541640).

Almost surely, 2^20666451510 is an apocalyptic number.

20666451510 is an abundant number, since it is smaller than the sum of its proper divisors (36840213450).

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

20666451510 is a wasteful number, since it uses less digits than its factorization.

20666451510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327970 (or 3327964 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 20666451510 in words is "twenty billion, six hundred sixty-six million, four hundred fifty-one thousand, five hundred ten".