20972834 has 4 divisors (see below), whose sum is σ = 31459254. Its totient is φ = 10486416.

The previous prime is 20972813. The next prime is 20972839. The reversal of 20972834 is 43827902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43827902 = 2 ⋅21913951.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 2093809 = 4345^2 + 1447^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20972794 and 20972803.

It is not an unprimeable number, because it can be changed into a prime (20972839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5243207 + ... + 5243210.

Almost surely, 2^20972834 is an apocalyptic number.

20972834 is a deficient number, since it is larger than the sum of its proper divisors (10486420).

20972834 is a wasteful number, since it uses less digits than its factorization.

20972834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486419.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20972834 is about 4579.6106821432. The cubic root of 20972834 is about 275.7733997399.

The spelling of 20972834 in words is "twenty million, nine hundred seventy-two thousand, eight hundred thirty-four".