20152021724 has 18 divisors (see below), whose sum is σ = 36105264720. Its totient is φ = 9841681416.

The previous prime is 20152021717. The next prime is 20152021741. The reversal of 20152021724 is 42712025102.

It is a super-2 number, since 2×20152021724² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20152021693 and 20152021702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1354964 + ... + 1369755.

It is an arithmetic number, because the mean of its divisors is an integer number (2005848040).

Almost surely, 2^20152021724 is an apocalyptic number.

It is an amenable number.

20152021724 is a deficient number, since it is larger than the sum of its proper divisors (15953242996).

20152021724 is a wasteful number, since it uses less digits than its factorization.

20152021724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724809 (or 2724764 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

Adding to 20152021724 its reverse (42712025102), we get a palindrome (62864046826).

The spelling of 20152021724 in words is "twenty billion, one hundred fifty-two million, twenty-one thousand, seven hundred twenty-four".