20710290 has 32 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 5481344.

The previous prime is 20710279. The next prime is 20710307. The reversal of 20710290 is 9201702.

It is a happy number.

It is a super-2 number, since 2×20710290² = 857832223768200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (1564920).

Almost surely, 2^20710290 is an apocalyptic number.

20710290 is an abundant number, since it is smaller than the sum of its proper divisors (29367150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20710290 is a wasteful number, since it uses less digits than its factorization.

20710290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20710290 is about 4550.8559634425. The cubic root of 20710290 is about 274.6178272600.

Adding to 20710290 its reverse (9201702), we get a palindrome (29911992).

The spelling of 20710290 in words is "twenty million, seven hundred ten thousand, two hundred ninety".