20894577 has 16 divisors (see below), whose sum is σ = 30697920. Its totient is φ = 12536000.

The previous prime is 20894569. The next prime is 20894579. The reversal of 20894577 is 77549802.

It is a cyclic number.

It is not a de Polignac number, because 20894577 - 2³ = 20894569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20894579) 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, 199 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (1918620).

Almost surely, 2^20894577 is an apocalyptic number.

It is an amenable number.

20894577 is a deficient number, since it is larger than the sum of its proper divisors (9803343).

20894577 is a wasteful number, since it uses less digits than its factorization.

20894577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20894577 is about 4571.0586301206. The cubic root of 20894577 is about 275.4299698047.

It can be divided in two parts, 2089 and 4577, that added together give a palindrome (6666).

The spelling of 20894577 in words is "twenty million, eight hundred ninety-four thousand, five hundred seventy-seven".