20545455 has 24 divisors (see below), whose sum is σ = 38241072. Its totient is φ = 9391872.

The previous prime is 20545433. The next prime is 20545477. The reversal of 20545455 is 55454502.

It is an interprime number because it is at equal distance from previous prime (20545433) and next prime (20545477).

It is not a de Polignac number, because 20545455 - 2⁵ = 20545423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13242 + ... + 14711.

It is an arithmetic number, because the mean of its divisors is an integer number (1593378).

Almost surely, 2^20545455 is an apocalyptic number.

20545455 is a deficient number, since it is larger than the sum of its proper divisors (17695617).

20545455 is a wasteful number, since it uses less digits than its factorization.

20545455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27975 (or 27968 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 30.

The square root of 20545455 is about 4532.7094546198. The cubic root of 20545455 is about 273.8873166927.

Adding to 20545455 its reverse (55454502), we get a palindrome (75999957).

The spelling of 20545455 in words is "twenty million, five hundred forty-five thousand, four hundred fifty-five".