20775242 has 4 divisors (see below), whose sum is σ = 31162866. Its totient is φ = 10387620.

The previous prime is 20775221. The next prime is 20775247. The reversal of 20775242 is 24257702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12243001 + 8532241 = 3499^2 + 2921^2 .

It is a super-2 number, since 2×20775242² = 863221360317128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20775247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5193809 + ... + 5193812.

Almost surely, 2^20775242 is an apocalyptic number.

20775242 is a deficient number, since it is larger than the sum of its proper divisors (10387624).

20775242 is a wasteful number, since it uses less digits than its factorization.

20775242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10387623.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20775242 is about 4557.9866169176. The cubic root of 20775242 is about 274.9046148529.

The spelling of 20775242 in words is "twenty million, seven hundred seventy-five thousand, two hundred forty-two".