20545156 has 24 divisors (see below), whose sum is σ = 38314080. Its totient is φ = 9611712.

The previous prime is 20545153. The next prime is 20545159. The reversal of 20545156 is 65154502.

It is an interprime number because it is at equal distance from previous prime (20545153) and next prime (20545159).

It is not an unprimeable number, because it can be changed into a prime (20545153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4680 + ... + 7936.

It is an arithmetic number, because the mean of its divisors is an integer number (1596420).

Almost surely, 2^20545156 is an apocalyptic number.

It is an amenable number.

20545156 is a deficient number, since it is larger than the sum of its proper divisors (17768924).

20545156 is a wasteful number, since it uses less digits than its factorization.

20545156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363 (or 3361 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 20545156 is about 4532.6764720196. The cubic root of 20545156 is about 273.8859880500.

Adding to 20545156 its reverse (65154502), we get a palindrome (85699658).

The spelling of 20545156 in words is "twenty million, five hundred forty-five thousand, one hundred fifty-six".