20775290 has 16 divisors (see below), whose sum is σ = 37683360. Its totient is φ = 8246160.

The previous prime is 20775259. The next prime is 20775299. The reversal of 20775290 is 9257702.

It is a super-2 number, since 2×20775290² = 863225349168200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20775299) 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, 6620 + ... + 9239.

It is an arithmetic number, because the mean of its divisors is an integer number (2355210).

Almost surely, 2^20775290 is an apocalyptic number.

20775290 is a deficient number, since it is larger than the sum of its proper divisors (16908070).

20775290 is a wasteful number, since it uses less digits than its factorization.

20775290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 20775290 is about 4557.9918823973. The cubic root of 20775290 is about 274.9048265698.

The spelling of 20775290 in words is "twenty million, seven hundred seventy-five thousand, two hundred ninety".