20434636 has 6 divisors (see below), whose sum is σ = 35760620. Its totient is φ = 10217316.

The previous prime is 20434607. The next prime is 20434643. The reversal of 20434636 is 63643402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554326 + ... + 2554333.

Almost surely, 2^20434636 is an apocalyptic number.

It is an amenable number.

20434636 is a deficient number, since it is larger than the sum of its proper divisors (15325984).

20434636 is a wasteful number, since it uses less digits than its factorization.

20434636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108663 (or 5108661 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 20434636 is about 4520.4685597845. The cubic root of 20434636 is about 273.3939934111.

The spelling of 20434636 in words is "twenty million, four hundred thirty-four thousand, six hundred thirty-six".