20605863494 has 16 divisors (see below), whose sum is σ = 31914362880. Its totient is φ = 9967919880.

The previous prime is 20605863491. The next prime is 20605863511. The reversal of 20605863494 is 49436850602.

It is a super-2 number, since 2×20605863494² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605863491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200867 + ... + 285585.

It is an arithmetic number, because the mean of its divisors is an integer number (1994647680).

Almost surely, 2^20605863494 is an apocalyptic number.

20605863494 is a deficient number, since it is larger than the sum of its proper divisors (11308499386).

20605863494 is a wasteful number, since it uses less digits than its factorization.

20605863494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88675.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20605863494 in words is "twenty billion, six hundred five million, eight hundred sixty-three thousand, four hundred ninety-four".