20616920 has 32 divisors (see below), whose sum is σ = 49118400. Its totient is φ = 7761408.

The previous prime is 20616899. The next prime is 20616923. The reversal of 20616920 is 2961602.

It is a self number, because there is not a number n which added to its sum of digits gives 20616920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20616923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14480 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (1534950).

Almost surely, 2^20616920 is an apocalyptic number.

20616920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20616920 is an abundant number, since it is smaller than the sum of its proper divisors (28501480).

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

20616920 is a wasteful number, since it uses less digits than its factorization.

20616920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30347 (or 30343 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20616920 is about 4540.5858652821. The cubic root of 20616920 is about 274.2045110354.

The spelling of 20616920 in words is "twenty million, six hundred sixteen thousand, nine hundred twenty".