20436955 has 32 divisors (see below), whose sum is σ = 30919680. Its totient is φ = 12597120.

The previous prime is 20436953. The next prime is 20436961. The reversal of 20436955 is 55963402.

It is not a de Polignac number, because 20436955 - 2¹ = 20436953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20436955.

It is not an unprimeable number, because it can be changed into a prime (20436953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41722 + ... + 42208.

It is an arithmetic number, because the mean of its divisors is an integer number (966240).

Almost surely, 2^20436955 is an apocalyptic number.

20436955 is a deficient number, since it is larger than the sum of its proper divisors (10482725).

20436955 is a wasteful number, since it uses less digits than its factorization.

20436955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20436955 is about 4520.7250524667. The cubic root of 20436955 is about 273.4043349490.

It can be divided in two parts, 2043 and 6955, that added together give a palindrome (8998).

The spelling of 20436955 in words is "twenty million, four hundred thirty-six thousand, nine hundred fifty-five".