20666531002 has 32 divisors (see below), whose sum is σ = 35271371520. Its totient is φ = 9002975040.

The previous prime is 20666530987. The next prime is 20666531009. The reversal of 20666531002 is 20013566602.

It is a super-3 number, since 3×20666531002³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20666531009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56688 + ... + 211060.

It is an arithmetic number, because the mean of its divisors is an integer number (1102230360).

Almost surely, 2^20666531002 is an apocalyptic number.

20666531002 is a deficient number, since it is larger than the sum of its proper divisors (14604840518).

20666531002 is a wasteful number, since it uses less digits than its factorization.

20666531002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154678.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 20666531002 in words is "twenty billion, six hundred sixty-six million, five hundred thirty-one thousand, two".