20021031124 has 6 divisors (see below), whose sum is σ = 35036804474. Its totient is φ = 10010515560.

The previous prime is 20021031091. The next prime is 20021031133. The reversal of 20021031124 is 42113012002.

It can be written as a sum of positive squares in only one way, i.e., 19991132100 + 29899024 = 141390^2 + 5468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20021031098 and 20021031107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2502628887 + ... + 2502628894.

Almost surely, 2^20021031124 is an apocalyptic number.

It is an amenable number.

20021031124 is a deficient number, since it is larger than the sum of its proper divisors (15015773350).

20021031124 is a wasteful number, since it uses less digits than its factorization.

20021031124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005257785 (or 5005257783 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20021031124 its reverse (42113012002), we get a palindrome (62134043126).

The spelling of 20021031124 in words is "twenty billion, twenty-one million, thirty-one thousand, one hundred twenty-four".