20957616 has 100 divisors (see below), whose sum is σ = 61636432. Its totient is φ = 6873984.

The previous prime is 20957611. The next prime is 20957621. The reversal of 20957616 is 61675902.

It is an interprime number because it is at equal distance from previous prime (20957611) and next prime (20957621).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20957611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 133410 + ... + 133566.

Almost surely, 2^20957616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20957616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30818216).

20957616 is an abundant number, since it is smaller than the sum of its proper divisors (40678816).

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

20957616 is a wasteful number, since it uses less digits than its factorization.

20957616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20957616 is about 4577.9488856911. The cubic root of 20957616 is about 275.7066827182.

The spelling of 20957616 in words is "twenty million, nine hundred fifty-seven thousand, six hundred sixteen".