20942907 has 4 divisors (see below), whose sum is σ = 27923880. Its totient is φ = 13961936.

The previous prime is 20942899. The next prime is 20942917. The reversal of 20942907 is 70924902.

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 20942907 - 2³ = 20942899 is a prime.

It is a super-2 number, since 2×20942907² = 877210707221298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20942917) 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, 3490482 + ... + 3490487.

It is an arithmetic number, because the mean of its divisors is an integer number (6980970).

Almost surely, 2^20942907 is an apocalyptic number.

20942907 is a deficient number, since it is larger than the sum of its proper divisors (6980973).

20942907 is an equidigital number, since it uses as much as digits as its factorization.

20942907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6980972.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20942907 is about 4576.3420982265. The cubic root of 20942907 is about 275.6421664947.

The spelling of 20942907 in words is "twenty million, nine hundred forty-two thousand, nine hundred seven".