20208194451 has 6 divisors (see below), whose sum is σ = 29189614220. Its totient is φ = 13472129628.

The previous prime is 20208194437. The next prime is 20208194483. The reversal of 20208194451 is 15449180202.

20208194451 is a `hidden beast` number, since 2 + 0 + 208 + 1 + 9 + 445 + 1 = 666.

It is not a de Polignac number, because 20208194451 - 2¹³ = 20208186259 is a prime.

It is a super-2 number, since 2×20208194451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208194351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122677461 + ... + 1122677478.

Almost surely, 2^20208194451 is an apocalyptic number.

20208194451 is a deficient number, since it is larger than the sum of its proper divisors (8981419769).

20208194451 is a wasteful number, since it uses less digits than its factorization.

20208194451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245354945 (or 2245354942 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 20208194451 in words is "twenty billion, two hundred eight million, one hundred ninety-four thousand, four hundred fifty-one".