20648290 has 32 divisors (see below), whose sum is σ = 41413680. Its totient is φ = 7359744.

The previous prime is 20648279. The next prime is 20648321. The reversal of 20648290 is 9284602.

It can be written as a sum of positive squares in 8 ways, for example, as 12880921 + 7767369 = 3589^2 + 2787^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032 + ... + 6508.

Almost surely, 2^20648290 is an apocalyptic number.

20648290 is an abundant number, since it is smaller than the sum of its proper divisors (20765390).

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

20648290 is a wasteful number, since it uses less digits than its factorization.

20648290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20648290 is about 4544.0389522978. The cubic root of 20648290 is about 274.3435139590.

The spelling of 20648290 in words is "twenty million, six hundred forty-eight thousand, two hundred ninety".