20572106 has 4 divisors (see below), whose sum is σ = 30858162. Its totient is φ = 10286052.

The previous prime is 20572099. The next prime is 20572121. The reversal of 20572106 is 60127502.

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., 15928081 + 4644025 = 3991^2 + 2155^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5143025 + ... + 5143028.

Almost surely, 2^20572106 is an apocalyptic number.

20572106 is a deficient number, since it is larger than the sum of its proper divisors (10286056).

20572106 is a wasteful number, since it uses less digits than its factorization.

20572106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10286055.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20572106 is about 4535.6483549764. The cubic root of 20572106 is about 274.0056918916.

Adding to 20572106 its reverse (60127502), we get a palindrome (80699608).

The spelling of 20572106 in words is "twenty million, five hundred seventy-two thousand, one hundred six".