19956701 has 4 divisors (see below), whose sum is σ = 20139900. Its totient is φ = 19773504.

The previous prime is 19956697. The next prime is 19956749. The reversal of 19956701 is 10765991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9060100 + 10896601 = 3010^2 + 3301^2 .

It is a cyclic number.

It is not a de Polignac number, because 19956701 - 2² = 19956697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19953701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91436 + ... + 91653.

It is an arithmetic number, because the mean of its divisors is an integer number (5034975).

Almost surely, 2^19956701 is an apocalyptic number.

It is an amenable number.

19956701 is a deficient number, since it is larger than the sum of its proper divisors (183199).

19956701 is a wasteful number, since it uses less digits than its factorization.

19956701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183198.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 19956701 is about 4467.2923566742. The cubic root of 19956701 is about 271.2457341808.

The spelling of 19956701 in words is "nineteen million, nine hundred fifty-six thousand, seven hundred one".