20217404 has 6 divisors (see below), whose sum is σ = 35380464. Its totient is φ = 10108700.

The previous prime is 20217401. The next prime is 20217409. The reversal of 20217404 is 40471202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527172 + ... + 2527179.

It is an arithmetic number, because the mean of its divisors is an integer number (5896744).

Almost surely, 2^20217404 is an apocalyptic number.

It is an amenable number.

20217404 is a deficient number, since it is larger than the sum of its proper divisors (15163060).

20217404 is a wasteful number, since it uses less digits than its factorization.

20217404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054355 (or 5054353 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20217404 is about 4496.3767635731. The cubic root of 20217404 is about 272.4217613392.

Adding to 20217404 its reverse (40471202), we get a palindrome (60688606).

The spelling of 20217404 in words is "twenty million, two hundred seventeen thousand, four hundred four".