20561622 has 8 divisors (see below), whose sum is σ = 41123256. Its totient is φ = 6853872.

The previous prime is 20561621. The next prime is 20561633. The reversal of 20561622 is 22616502.

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

20561622 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20561592 and 20561601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561621) 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, 1713463 + ... + 1713474.

It is an arithmetic number, because the mean of its divisors is an integer number (5140407).

Almost surely, 2^20561622 is an apocalyptic number.

20561622 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.

20561622 is a wasteful number, since it uses less digits than its factorization.

20561622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426942.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20561622 is about 4534.4924743570. The cubic root of 20561622 is about 273.9591375297.

The spelling of 20561622 in words is "twenty million, five hundred sixty-one thousand, six hundred twenty-two".