20157770 has 8 divisors (see below), whose sum is σ = 36284004. Its totient is φ = 8063104.

The previous prime is 20157751. The next prime is 20157779. The reversal of 20157770 is 7775102.

It can be written as a sum of positive squares in 2 ways, for example, as 17783089 + 2374681 = 4217^2 + 1541^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20157779) 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, 1007879 + ... + 1007898.

Almost surely, 2^20157770 is an apocalyptic number.

20157770 is a deficient number, since it is larger than the sum of its proper divisors (16126234).

20157770 is a wasteful number, since it uses less digits than its factorization.

20157770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015784.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 20157770 is about 4489.7405270238. The cubic root of 20157770 is about 272.1536491322.

The spelling of 20157770 in words is "twenty million, one hundred fifty-seven thousand, seven hundred seventy".