20047634 has 4 divisors (see below), whose sum is σ = 30071454. Its totient is φ = 10023816.

The previous prime is 20047633. The next prime is 20047639. The reversal of 20047634 is 43674002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19333609 + 714025 = 4397^2 + 845^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20047633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5011907 + ... + 5011910.

Almost surely, 2^20047634 is an apocalyptic number.

20047634 is a deficient number, since it is larger than the sum of its proper divisors (10023820).

20047634 is a wasteful number, since it uses less digits than its factorization.

20047634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10023819.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20047634 is about 4477.4584308511. The cubic root of 20047634 is about 271.6570884165.

The spelling of 20047634 in words is "twenty million, forty-seven thousand, six hundred thirty-four".