20404534 has 8 divisors (see below), whose sum is σ = 30716568. Its totient is φ = 10165680.

The previous prime is 20404493. The next prime is 20404547. The reversal of 20404534 is 43540402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17592 + ... + 18715.

It is an arithmetic number, because the mean of its divisors is an integer number (3839571).

Almost surely, 2^20404534 is an apocalyptic number.

20404534 is a deficient number, since it is larger than the sum of its proper divisors (10312034).

20404534 is a wasteful number, since it uses less digits than its factorization.

20404534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36590.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20404534 is about 4517.1378106053. The cubic root of 20404534 is about 273.2596830450.

Adding to 20404534 its reverse (43540402), we get a palindrome (63944936).

The spelling of 20404534 in words is "twenty million, four hundred four thousand, five hundred thirty-four".