20123536 has 10 divisors (see below), whose sum is σ = 38989382. Its totient is φ = 10061760.

The previous prime is 20123513. The next prime is 20123539. The reversal of 20123536 is 63532102.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 8179600 = 3456^2 + 2860^2 .

It is a super-2 number, since 2×20123536² = 809913402286592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20123539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628845 + ... + 628876.

Almost surely, 2^20123536 is an apocalyptic number.

It is an amenable number.

20123536 is a deficient number, since it is larger than the sum of its proper divisors (18865846).

20123536 is a wasteful number, since it uses less digits than its factorization.

20123536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257729 (or 1257723 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20123536 is about 4485.9264372034. The cubic root of 20123536 is about 271.9994953855. Note that the first 3 decimals are identical.

Adding to 20123536 its reverse (63532102), we get a palindrome (83655638).

The spelling of 20123536 in words is "twenty million, one hundred twenty-three thousand, five hundred thirty-six".