20072155 has 8 divisors (see below), whose sum is σ = 25503552. Its totient is φ = 15113088.

The previous prime is 20072141. The next prime is 20072161. The reversal of 20072155 is 55127002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20072155 - 2⁷ = 20072027 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117987 + ... + 118156.

It is an arithmetic number, because the mean of its divisors is an integer number (3187944).

Almost surely, 2^20072155 is an apocalyptic number.

20072155 is a deficient number, since it is larger than the sum of its proper divisors (5431397).

20072155 is a wasteful number, since it uses less digits than its factorization.

20072155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236165.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20072155 is about 4480.1958662541. The cubic root of 20072155 is about 271.7678012221.

Adding to 20072155 its reverse (55127002), we get a palindrome (75199157).

The spelling of 20072155 in words is "twenty million, seventy-two thousand, one hundred fifty-five".