19900705 has 16 divisors (see below), whose sum is σ = 26547264. Its totient is φ = 14198080.

The previous prime is 19900697. The next prime is 19900711. The reversal of 19900705 is 50700991.

It is not a de Polignac number, because 19900705 - 2³ = 19900697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (1659204).

Almost surely, 2^19900705 is an apocalyptic number.

It is an amenable number.

19900705 is a deficient number, since it is larger than the sum of its proper divisors (6646559).

19900705 is a wasteful number, since it uses less digits than its factorization.

19900705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6896.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 19900705 is about 4461.0206231310. The cubic root of 19900705 is about 270.9918026959.

The spelling of 19900705 in words is "nineteen million, nine hundred thousand, seven hundred five".