20472706 has 4 divisors (see below), whose sum is σ = 30709062. Its totient is φ = 10236352.

The previous prime is 20472703. The next prime is 20472713. The reversal of 20472706 is 60727402.

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., 19847025 + 625681 = 4455^2 + 791^2 .

It is not an unprimeable number, because it can be changed into a prime (20472703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5118175 + ... + 5118178.

Almost surely, 2^20472706 is an apocalyptic number.

20472706 is a deficient number, since it is larger than the sum of its proper divisors (10236356).

20472706 is a wasteful number, since it uses less digits than its factorization.

20472706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236355.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20472706 is about 4524.6774470674. The cubic root of 20472706 is about 273.5636669746.

It can be divided in two parts, 2047270 and 6, that added together give a triangular number (2047276 = T₂₀₂₃).

The spelling of 20472706 in words is "twenty million, four hundred seventy-two thousand, seven hundred six".