20955157 has 4 divisors (see below), whose sum is σ = 22058080. Its totient is φ = 19852236.

The previous prime is 20955133. The next prime is 20955167. The reversal of 20955157 is 75155902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20955157 - 2⁷ = 20955029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551433 + ... + 551470.

It is an arithmetic number, because the mean of its divisors is an integer number (5514520).

Almost surely, 2^20955157 is an apocalyptic number.

It is an amenable number.

20955157 is a deficient number, since it is larger than the sum of its proper divisors (1102923).

20955157 is a wasteful number, since it uses less digits than its factorization.

20955157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102922.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 20955157 is about 4577.6803077541. The cubic root of 20955157 is about 275.6958992199.

It can be divided in two parts, 20955 and 157, that added together give a palindrome (21112).

The spelling of 20955157 in words is "twenty million, nine hundred fifty-five thousand, one hundred fifty-seven".