20195616 has 96 divisors (see below), whose sum is σ = 62149248. Its totient is φ = 5621760.

The previous prime is 20195603. The next prime is 20195621. The reversal of 20195616 is 61659102.

20195616 = T₇₆₉ + T₇₇₀ + ... + T₈₃₁.

20195616 = 109² + 110² + ... + 395².

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27186 + ... + 27918.

It is an arithmetic number, because the mean of its divisors is an integer number (647388).

Almost surely, 2^20195616 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 20195616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31074624).

20195616 is an abundant number, since it is smaller than the sum of its proper divisors (41953632).

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

20195616 is a wasteful number, since it uses less digits than its factorization.

20195616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20195616 is about 4493.9532707851. The cubic root of 20195616 is about 272.3238645168.

The spelling of 20195616 in words is "twenty million, one hundred ninety-five thousand, six hundred sixteen".