20617940 has 48 divisors (see below), whose sum is σ = 52399872. Its totient is φ = 6652416.

The previous prime is 20617931. The next prime is 20617943. The reversal of 20617940 is 4971602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617943) 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 15 ways as a sum of consecutive naturals, for example, 1952 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^20617940 is an apocalyptic number.

20617940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20617940 is an abundant number, since it is smaller than the sum of its proper divisors (31781932).

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

20617940 is a wasteful number, since it uses less digits than its factorization.

20617940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8696 (or 8694 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20617940 is about 4540.6981842003. The cubic root of 20617940 is about 274.2090329522.

It can be divided in two parts, 2061 and 7940, that added together give a palindrome (10001).

The spelling of 20617940 in words is "twenty million, six hundred seventeen thousand, nine hundred forty".