20722036 has 12 divisors (see below), whose sum is σ = 36449028. Its totient is φ = 10308032.

The previous prime is 20722007. The next prime is 20722073. The reversal of 20722036 is 63022702.

It can be written as a sum of positive squares in 2 ways, for example, as 16353936 + 4368100 = 4044^2 + 2090^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20721998 and 20722016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12361 + ... + 13936.

It is an arithmetic number, because the mean of its divisors is an integer number (3037419).

Almost surely, 2^20722036 is an apocalyptic number.

It is an amenable number.

20722036 is a deficient number, since it is larger than the sum of its proper divisors (15726992).

20722036 is a wasteful number, since it uses less digits than its factorization.

20722036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26498 (or 26496 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20722036 is about 4552.1463069633. The cubic root of 20722036 is about 274.6697346512.

Adding to 20722036 its reverse (63022702), we get a palindrome (83744738).

The spelling of 20722036 in words is "twenty million, seven hundred twenty-two thousand, thirty-six".