20628554 has 8 divisors (see below), whose sum is σ = 31526820. Its totient is φ = 10119616.

The previous prime is 20628529. The next prime is 20628557. The reversal of 20628554 is 45582602.

It can be written as a sum of positive squares in 2 ways, for example, as 19598329 + 1030225 = 4427^2 + 1015^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20628554.

It is not an unprimeable number, because it can be changed into a prime (20628557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97199 + ... + 97410.

Almost surely, 2^20628554 is an apocalyptic number.

20628554 is a deficient number, since it is larger than the sum of its proper divisors (10898266).

20628554 is a wasteful number, since it uses less digits than its factorization.

20628554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194664.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 20628554 is about 4541.8667968138. The cubic root of 20628554 is about 274.2560786382.

The spelling of 20628554 in words is "twenty million, six hundred twenty-eight thousand, five hundred fifty-four".