20021001996 has 24 divisors (see below), whose sum is σ = 46718763840. Its totient is φ = 6673225552.

The previous prime is 20021001989. The next prime is 20021001997. The reversal of 20021001996 is 69910012002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20021001997) 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, 170515 + ... + 262901.

It is an arithmetic number, because the mean of its divisors is an integer number (1946615160).

Almost surely, 2^20021001996 is an apocalyptic number.

It is an amenable number.

20021001996 is an abundant number, since it is smaller than the sum of its proper divisors (26697761844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021001996 is a wasteful number, since it uses less digits than its factorization.

20021001996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110453 (or 110451 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

Adding to 20021001996 its reverse (69910012002), we get a palindrome (89931013998).

The spelling of 20021001996 in words is "twenty billion, twenty-one million, one thousand, nine hundred ninety-six".