20349747 has 12 divisors (see below), whose sum is σ = 32066424. Its totient is φ = 12333120.

The previous prime is 20349743. The next prime is 20349751. The reversal of 20349747 is 74794302.

It is an interprime number because it is at equal distance from previous prime (20349743) and next prime (20349751).

It is not a de Polignac number, because 20349747 - 2² = 20349743 is a prime.

It is a super-2 number, since 2×20349747² = 828224405928018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20349743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102678 + ... + 102875.

It is an arithmetic number, because the mean of its divisors is an integer number (2672202).

Almost surely, 2^20349747 is an apocalyptic number.

20349747 is a deficient number, since it is larger than the sum of its proper divisors (11716677).

20349747 is a wasteful number, since it uses less digits than its factorization.

20349747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205570 (or 205567 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 20349747 is about 4511.0693854118. The cubic root of 20349747 is about 273.0148927189.

It can be divided in two parts, 2034 and 9747, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 20349747 in words is "twenty million, three hundred forty-nine thousand, seven hundred forty-seven".