20701945 has 8 divisors (see below), whose sum is σ = 27100800. Its totient is φ = 15055920.

The previous prime is 20701921. The next prime is 20701951. The reversal of 20701945 is 54910702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20701945 - 2⁵ = 20701913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188145 + ... + 188254.

It is an arithmetic number, because the mean of its divisors is an integer number (3387600).

Almost surely, 2^20701945 is an apocalyptic number.

It is an amenable number.

20701945 is a deficient number, since it is larger than the sum of its proper divisors (6398855).

20701945 is a wasteful number, since it uses less digits than its factorization.

20701945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376415.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20701945 is about 4549.9390105803. The cubic root of 20701945 is about 274.5809374878.

The spelling of 20701945 in words is "twenty million, seven hundred one thousand, nine hundred forty-five".