20954657 has 4 divisors (see below), whose sum is σ = 20971776. Its totient is φ = 20937540.

The previous prime is 20954653. The next prime is 20954683. The reversal of 20954657 is 75645902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20954657 - 2² = 20954653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20954657.

It is not an unprimeable number, because it can be changed into a prime (20954653) 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, 6569 + ... + 9222.

It is an arithmetic number, because the mean of its divisors is an integer number (5242944).

Almost surely, 2^20954657 is an apocalyptic number.

It is an amenable number.

20954657 is a deficient number, since it is larger than the sum of its proper divisors (17119).

20954657 is a wasteful number, since it uses less digits than its factorization.

20954657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17118.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20954657 is about 4577.6256946151. The cubic root of 20954657 is about 275.6937064574.

The spelling of 20954657 in words is "twenty million, nine hundred fifty-four thousand, six hundred fifty-seven".