20619811216 has 15 divisors (see below), whose sum is σ = 39951997131. Its totient is φ = 10309618416.

The previous prime is 20619811193. The next prime is 20619811291. The reversal of 20619811216 is 61211891602.

The square root of 20619811216 is 143596.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×20619811216² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 556435 + ... + 592333.

Almost surely, 2^20619811216 is an apocalyptic number.

20619811216 is the 143596-th square number.

It is an amenable number.

20619811216 is a deficient number, since it is larger than the sum of its proper divisors (19332185915).

20619811216 is an frugal number, since it uses more digits than its factorization.

20619811216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71806 (or 35901 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 20619811216 in words is "twenty billion, six hundred nineteen million, eight hundred eleven thousand, two hundred sixteen".