20634620 has 12 divisors (see below), whose sum is σ = 43332744. Its totient is φ = 8253840.

The previous prime is 20634619. The next prime is 20634643. The reversal of 20634620 is 2643602.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515846 + ... + 515885.

It is an arithmetic number, because the mean of its divisors is an integer number (3611062).

Almost surely, 2^20634620 is an apocalyptic number.

20634620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20634620 is an abundant number, since it is smaller than the sum of its proper divisors (22698124).

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

20634620 is a wasteful number, since it uses less digits than its factorization.

20634620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031740 (or 1031738 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20634620 is about 4542.5345348164. The cubic root of 20634620 is about 274.2829584400.

The spelling of 20634620 in words is "twenty million, six hundred thirty-four thousand, six hundred twenty".