20972002 has 4 divisors (see below), whose sum is σ = 31458006. Its totient is φ = 10486000.

The previous prime is 20971997. The next prime is 20972023. The reversal of 20972002 is 20027902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20027902 = 2 ⋅10013951.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 4761 = 4579^2 + 69^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5242999 + ... + 5243002.

Almost surely, 2^20972002 is an apocalyptic number.

20972002 is a deficient number, since it is larger than the sum of its proper divisors (10486004).

20972002 is a wasteful number, since it uses less digits than its factorization.

20972002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10486003.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20972002 is about 4579.5198438264. The cubic root of 20972002 is about 275.7697530144.

Adding to 20972002 its reverse (20027902), we get a palindrome (40999904).

The spelling of 20972002 in words is "twenty million, nine hundred seventy-two thousand, two".