19908684950 has 48 divisors (see below), whose sum is σ = 46167473664. Its totient is φ = 6205303200.

The previous prime is 19908684949. The next prime is 19908684953. The reversal of 19908684950 is 5948680991.

It is a self number, because there is not a number n which added to its sum of digits gives 19908684950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19908684953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2581694 + ... + 2589393.

It is an arithmetic number, because the mean of its divisors is an integer number (961822368).

Almost surely, 2^19908684950 is an apocalyptic number.

19908684950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19908684950 is an abundant number, since it is smaller than the sum of its proper divisors (26258788714).

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

19908684950 is a wasteful number, since it uses less digits than its factorization.

19908684950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171117 (or 5171112 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 59.

The spelling of 19908684950 in words is "nineteen billion, nine hundred eight million, six hundred eighty-four thousand, nine hundred fifty".