20549157 has 8 divisors (see below), whose sum is σ = 27670560. Its totient is φ = 13563600.

The previous prime is 20549153. The next prime is 20549161. The reversal of 20549157 is 75194502.

It is an interprime number because it is at equal distance from previous prime (20549153) and next prime (20549161).

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

It is not a de Polignac number, because 20549157 - 2² = 20549153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33607 + ... + 34212.

It is an arithmetic number, because the mean of its divisors is an integer number (3458820).

Almost surely, 2^20549157 is an apocalyptic number.

It is an amenable number.

20549157 is a deficient number, since it is larger than the sum of its proper divisors (7121403).

20549157 is a wasteful number, since it uses less digits than its factorization.

20549157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67923.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20549157 is about 4533.1178012489. The cubic root of 20549157 is about 273.9037659099.

It can be divided in two parts, 20549 and 157, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20549157 in words is "twenty million, five hundred forty-nine thousand, one hundred fifty-seven".