20295990 has 192 divisors, whose sum is σ = 66044160. Its totient is φ = 4250880.

The previous prime is 20295967. The next prime is 20295991. The reversal of 20295990 is 9959202.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20295991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 244489 + ... + 244571.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^20295990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20295990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

20295990 is an abundant number, since it is smaller than the sum of its proper divisors (45748170).

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

20295990 is a wasteful number, since it uses less digits than its factorization.

20295990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 20295990 is about 4505.1071019455. The cubic root of 20295990 is about 272.7742770499.

The spelling of 20295990 in words is "twenty million, two hundred ninety-five thousand, nine hundred ninety".