20619960 has 128 divisors (see below), whose sum is σ = 66908160. Its totient is φ = 5068800.

The previous prime is 20619943. The next prime is 20619979. The reversal of 20619960 is 6991602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85440 + ... + 85680.

It is an arithmetic number, because the mean of its divisors is an integer number (522720).

Almost surely, 2^20619960 is an apocalyptic number.

20619960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20619960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33454080).

20619960 is an abundant number, since it is smaller than the sum of its proper divisors (46288200).

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

20619960 is a wasteful number, since it uses less digits than its factorization.

20619960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 20619960 is about 4540.9206115060. The cubic root of 20619960 is about 274.2179876806.

It can be divided in two parts, 2061 and 9960, that added together give a palindrome (12021).

The spelling of 20619960 in words is "twenty million, six hundred nineteen thousand, nine hundred sixty".