20029291009 has 24 divisors (see below), whose sum is σ = 26412267840. Its totient is φ = 15013270944.

The previous prime is 20029291001. The next prime is 20029291021. The reversal of 20029291009 is 90019292002.

It is not a de Polignac number, because 20029291009 - 2³ = 20029291001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20029291001) 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, 815349 + ... + 839554.

It is an arithmetic number, because the mean of its divisors is an integer number (1100511160).

Almost surely, 2^20029291009 is an apocalyptic number.

It is an amenable number.

20029291009 is a deficient number, since it is larger than the sum of its proper divisors (6382976831).

20029291009 is a wasteful number, since it uses less digits than its factorization.

20029291009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654949 (or 1654942 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 20029291009 in words is "twenty billion, twenty-nine million, two hundred ninety-one thousand, nine".