20666455026 has 32 divisors (see below), whose sum is σ = 47244023808. Its totient is φ = 5903899920.

The previous prime is 20666455013. The next prime is 20666455027. The reversal of 20666455026 is 62055466602.

It is a super-3 number, since 3×20666455026³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20666455027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324921 + ... + 383283.

It is an arithmetic number, because the mean of its divisors is an integer number (1476375744).

Almost surely, 2^20666455026 is an apocalyptic number.

20666455026 is an abundant number, since it is smaller than the sum of its proper divisors (26577568782).

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

20666455026 is a wasteful number, since it uses less digits than its factorization.

20666455026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66806.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 20666455026 in words is "twenty billion, six hundred sixty-six million, four hundred fifty-five thousand, twenty-six".