20712407 has 4 divisors (see below), whose sum is σ = 20725656. Its totient is φ = 20699160.

The previous prime is 20712403. The next prime is 20712431. The reversal of 20712407 is 70421702.

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

It is a cyclic number.

It is not a de Polignac number, because 20712407 - 2² = 20712403 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 (20712403) 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, 3908 + ... + 7529.

It is an arithmetic number, because the mean of its divisors is an integer number (5181414).

Almost surely, 2^20712407 is an apocalyptic number.

20712407 is a deficient number, since it is larger than the sum of its proper divisors (13249).

20712407 is a wasteful number, since it uses less digits than its factorization.

20712407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13248.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20712407 is about 4551.0885511051. The cubic root of 20712407 is about 274.6271840601.

The spelling of 20712407 in words is "twenty million, seven hundred twelve thousand, four hundred seven".