20628634 has 16 divisors (see below), whose sum is σ = 33651072. Its totient is φ = 9427248.

The previous prime is 20628613. The next prime is 20628653. The reversal of 20628634 is 43682602.

It is a junction number, because it is equal to n+sod(n) for n = 20628596 and 20628605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1174 + ... + 6529.

It is an arithmetic number, because the mean of its divisors is an integer number (2103192).

Almost surely, 2^20628634 is an apocalyptic number.

20628634 is a deficient number, since it is larger than the sum of its proper divisors (13022438).

20628634 is a wasteful number, since it uses less digits than its factorization.

20628634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20628634 is about 4541.8756037567. The cubic root of 20628634 is about 274.2564331703.

The spelling of 20628634 in words is "twenty million, six hundred twenty-eight thousand, six hundred thirty-four".