20500455 has 16 divisors (see below), whose sum is σ = 33859584. Its totient is φ = 10580640.

The previous prime is 20500439. The next prime is 20500457. The reversal of 20500455 is 55400502.

It is not a de Polignac number, because 20500455 - 2⁴ = 20500439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21579 + ... + 22508.

It is an arithmetic number, because the mean of its divisors is an integer number (2116224).

Almost surely, 2^20500455 is an apocalyptic number.

20500455 is a deficient number, since it is larger than the sum of its proper divisors (13359129).

20500455 is a wasteful number, since it uses less digits than its factorization.

20500455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44126.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20500455 is about 4527.7428151343. The cubic root of 20500455 is about 273.6872085503.

Adding to 20500455 its reverse (55400502), we get a palindrome (75900957).

The spelling of 20500455 in words is "twenty million, five hundred thousand, four hundred fifty-five".