19908534 has 16 divisors (see below), whose sum is σ = 40788720. Its totient is φ = 6474240.

The previous prime is 19908481. The next prime is 19908563. The reversal of 19908534 is 43580991.

It is a junction number, because it is equal to n+sod(n) for n = 19908492 and 19908501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40219 + ... + 40710.

It is an arithmetic number, because the mean of its divisors is an integer number (2549295).

Almost surely, 2^19908534 is an apocalyptic number.

19908534 is an abundant number, since it is smaller than the sum of its proper divisors (20880186).

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

19908534 is a wasteful number, since it uses less digits than its factorization.

19908534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80975.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 19908534 is about 4461.8980266250. The cubic root of 19908534 is about 271.0273343797.

The spelling of 19908534 in words is "nineteen million, nine hundred eight thousand, five hundred thirty-four".