20516745 has 8 divisors (see below), whose sum is σ = 32826816. Its totient is φ = 10942256.

The previous prime is 20516737. The next prime is 20516753. The reversal of 20516745 is 54761502.

It is an interprime number because it is at equal distance from previous prime (20516737) and next prime (20516753).

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

It is a cyclic number.

It is not a de Polignac number, because 20516745 - 2³ = 20516737 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, 683877 + ... + 683906.

It is an arithmetic number, because the mean of its divisors is an integer number (4103352).

Almost surely, 2^20516745 is an apocalyptic number.

It is an amenable number.

20516745 is a deficient number, since it is larger than the sum of its proper divisors (12310071).

20516745 is a wasteful number, since it uses less digits than its factorization.

20516745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367791.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20516745 is about 4529.5413675117. The cubic root of 20516745 is about 273.7596814824.

The spelling of 20516745 in words is "twenty million, five hundred sixteen thousand, seven hundred forty-five".