20217154 has 4 divisors (see below), whose sum is σ = 30325734. Its totient is φ = 10108576.

The previous prime is 20217137. The next prime is 20217163. The reversal of 20217154 is 45171202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45171202 = 2 ⋅22585601.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 7436529 = 3575^2 + 2727^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5054287 + ... + 5054290.

Almost surely, 2^20217154 is an apocalyptic number.

20217154 is a deficient number, since it is larger than the sum of its proper divisors (10108580).

20217154 is a wasteful number, since it uses less digits than its factorization.

20217154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108579.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20217154 is about 4496.3489633257. The cubic root of 20217154 is about 272.4206384499.

Adding to 20217154 its reverse (45171202), we get a palindrome (65388356).

The spelling of 20217154 in words is "twenty million, two hundred seventeen thousand, one hundred fifty-four".