20456536 has 8 divisors (see below), whose sum is σ = 38356020. Its totient is φ = 10228264.

The previous prime is 20456509. The next prime is 20456537. The reversal of 20456536 is 63565402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20456498 and 20456507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278526 + ... + 1278541.

Almost surely, 2^20456536 is an apocalyptic number.

It is an amenable number.

20456536 is a deficient number, since it is larger than the sum of its proper divisors (17899484).

20456536 is a wasteful number, since it uses less digits than its factorization.

20456536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557073 (or 2557069 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20456536 is about 4522.8902263929. The cubic root of 20456536 is about 273.4916248840.

The spelling of 20456536 in words is "twenty million, four hundred fifty-six thousand, five hundred thirty-six".