20526644 has 12 divisors (see below), whose sum is σ = 36080100. Its totient is φ = 10218048.

The previous prime is 20526643. The next prime is 20526661. The reversal of 20526644 is 44662502.

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 4622500 = 3988^2 + 2150^2 .

It is a super-2 number, since 2×20526644² = 842686227805472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20526641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10289 + ... + 12120.

It is an arithmetic number, because the mean of its divisors is an integer number (3006675).

Almost surely, 2^20526644 is an apocalyptic number.

It is an amenable number.

20526644 is a deficient number, since it is larger than the sum of its proper divisors (15553456).

20526644 is a wasteful number, since it uses less digits than its factorization.

20526644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22642 (or 22640 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20526644 is about 4530.6339512258. The cubic root of 20526644 is about 273.8037026201.

The spelling of 20526644 in words is "twenty million, five hundred twenty-six thousand, six hundred forty-four".