20218024 has 8 divisors (see below), whose sum is σ = 37908810. Its totient is φ = 10109008.

The previous prime is 20218013. The next prime is 20218027. The reversal of 20218024 is 42081202.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 2829124 = 4170^2 + 1682^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20217992 and 20218010.

It is not an unprimeable number, because it can be changed into a prime (20218027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1263619 + ... + 1263634.

Almost surely, 2^20218024 is an apocalyptic number.

It is an amenable number.

20218024 is a deficient number, since it is larger than the sum of its proper divisors (17690786).

20218024 is a wasteful number, since it uses less digits than its factorization.

20218024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527259 (or 2527255 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20218024 is about 4496.4457074449. The cubic root of 20218024 is about 272.4245460647.

Adding to 20218024 its reverse (42081202), we get a palindrome (62299226).

The spelling of 20218024 in words is "twenty million, two hundred eighteen thousand, twenty-four".