20706472 has 8 divisors (see below), whose sum is σ = 38824650. Its totient is φ = 10353232.

The previous prime is 20706457. The next prime is 20706503. The reversal of 20706472 is 27460702.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 2268036 = 4294^2 + 1506^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20706472.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1294147 + ... + 1294162.

Almost surely, 2^20706472 is an apocalyptic number.

It is an amenable number.

20706472 is a deficient number, since it is larger than the sum of its proper divisors (18118178).

20706472 is a wasteful number, since it uses less digits than its factorization.

20706472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588315 (or 2588311 counting only the distinct ones).

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

The square root of 20706472 is about 4550.4364625825. The cubic root of 20706472 is about 274.6009507009.

The spelling of 20706472 in words is "twenty million, seven hundred six thousand, four hundred seventy-two".