20031721006 has 16 divisors (see below), whose sum is σ = 32826642048. Its totient is φ = 9092143800.

The previous prime is 20031720983. The next prime is 20031721007. The reversal of 20031721006 is 60012713002.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031721007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643650 + ... + 674053.

It is an arithmetic number, because the mean of its divisors is an integer number (2051665128).

Almost surely, 2^20031721006 is an apocalyptic number.

20031721006 is a deficient number, since it is larger than the sum of its proper divisors (12794921042).

20031721006 is a wasteful number, since it uses less digits than its factorization.

20031721006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318407.

The product of its (nonzero) digits is 504, while the sum is 22.

The spelling of 20031721006 in words is "twenty billion, thirty-one million, seven hundred twenty-one thousand, six".