20561694 has 8 divisors (see below), whose sum is σ = 41123400. Its totient is φ = 6853896.

The previous prime is 20561693. The next prime is 20561707. The reversal of 20561694 is 49616502.

It is a sphenic number, since it is the product of 3 distinct primes.

20561694 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561693) 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, 1713469 + ... + 1713480.

It is an arithmetic number, because the mean of its divisors is an integer number (5140425).

Almost surely, 2^20561694 is an apocalyptic number.

20561694 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20561694 is a wasteful number, since it uses less digits than its factorization.

20561694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426954.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20561694 is about 4534.5004134965. The cubic root of 20561694 is about 273.9594573008.

The spelling of 20561694 in words is "twenty million, five hundred sixty-one thousand, six hundred ninety-four".