20021009924 has 24 divisors (see below), whose sum is σ = 35362293120. Its totient is φ = 9917924576.

The previous prime is 20021009923. The next prime is 20021009999. The reversal of 20021009924 is 42990012002.

It is not an unprimeable number, because it can be changed into a prime (20021009923) 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, 135179 + ... + 241485.

It is an arithmetic number, because the mean of its divisors is an integer number (1473428880).

Almost surely, 2^20021009924 is an apocalyptic number.

It is an amenable number.

20021009924 is a deficient number, since it is larger than the sum of its proper divisors (15341283196).

20021009924 is a wasteful number, since it uses less digits than its factorization.

20021009924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106747 (or 106745 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 20021009924 in words is "twenty billion, twenty-one million, nine thousand, nine hundred twenty-four".