20526990 has 64 divisors (see below), whose sum is σ = 56920320. Its totient is φ = 4682240.

The previous prime is 20526977. The next prime is 20526997. The reversal of 20526990 is 9962502.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20526997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3781 + ... + 7439.

It is an arithmetic number, because the mean of its divisors is an integer number (889380).

Almost surely, 2^20526990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20526990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28460160).

20526990 is an abundant number, since it is smaller than the sum of its proper divisors (36393330).

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

20526990 is a wasteful number, since it uses less digits than its factorization.

20526990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3697.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20526990 is about 4530.6721355666. The cubic root of 20526990 is about 273.8052410360.

The spelling of 20526990 in words is "twenty million, five hundred twenty-six thousand, nine hundred ninety".