20208749634 has 24 divisors (see below), whose sum is σ = 43788401280. Its totient is φ = 6735822648.

The previous prime is 20208749621. The next prime is 20208749641. The reversal of 20208749634 is 43694780202.

20208749634 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 8 + 7 + 4 + 9 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20208749634.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400387 + ... + 448025.

It is an arithmetic number, because the mean of its divisors is an integer number (1824516720).

Almost surely, 2^20208749634 is an apocalyptic number.

20208749634 is an abundant number, since it is smaller than the sum of its proper divisors (23579651646).

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

20208749634 is a wasteful number, since it uses less digits than its factorization.

20208749634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71214 (or 71211 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20208749634 in words is "twenty billion, two hundred eight million, seven hundred forty-nine thousand, six hundred thirty-four".