20972055 has 24 divisors (see below), whose sum is σ = 36339408. Its totient is φ = 10323456.

The previous prime is 20972053. The next prime is 20972059. The reversal of 20972055 is 55027902.

It is a happy number.

It is not a de Polignac number, because 20972055 - 2¹ = 20972053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972053) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 1602 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (1514142).

Almost surely, 2^20972055 is an apocalyptic number.

20972055 is a deficient number, since it is larger than the sum of its proper divisors (15367353).

20972055 is a wasteful number, since it uses less digits than its factorization.

20972055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8307 (or 8294 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 20972055 is about 4579.5256304556. The cubic root of 20972055 is about 275.7699853207.

Adding to 20972055 its reverse (55027902), we get a palindrome (75999957).

The spelling of 20972055 in words is "twenty million, nine hundred seventy-two thousand, fifty-five".