20622551 has 4 divisors (see below), whose sum is σ = 20727432. Its totient is φ = 20517672.

The previous prime is 20622529. The next prime is 20622583. The reversal of 20622551 is 15522602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15522602 = 2 ⋅7761301.

It is a cyclic number.

It is not a de Polignac number, because 20622551 - 2⁶ = 20622487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20622851) 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, 52145 + ... + 52538.

It is an arithmetic number, because the mean of its divisors is an integer number (5181858).

Almost surely, 2^20622551 is an apocalyptic number.

20622551 is a deficient number, since it is larger than the sum of its proper divisors (104881).

20622551 is a wasteful number, since it uses less digits than its factorization.

20622551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104880.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20622551 is about 4541.2058971159. The cubic root of 20622551 is about 274.2294728152.

The spelling of 20622551 in words is "twenty million, six hundred twenty-two thousand, five hundred fifty-one".