20929640290 has 16 divisors (see below), whose sum is σ = 40571302968. Its totient is φ = 7727867136.

The previous prime is 20929640243. The next prime is 20929640293. The reversal of 20929640290 is 9204692902.

It can be written as a sum of positive squares in 4 ways, for example, as 13532436241 + 7397204049 = 116329^2 + 86007^2 .

It is not an unprimeable number, because it can be changed into a prime (20929640293) 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 7 ways as a sum of consecutive naturals, for example, 80498487 + ... + 80498746.

Almost surely, 2^20929640290 is an apocalyptic number.

20929640290 is a deficient number, since it is larger than the sum of its proper divisors (19641662678).

20929640290 is a wasteful number, since it uses less digits than its factorization.

20929640290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160997253.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 20929640290 in words is "twenty billion, nine hundred twenty-nine million, six hundred forty thousand, two hundred ninety".