20934487 has 8 divisors (see below), whose sum is σ = 23962400. Its totient is φ = 17915904.

The previous prime is 20934481. The next prime is 20934499. The reversal of 20934487 is 78443902.

It is a happy number.

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

It is a 13-Lehmer number, since φ(20934487) divides (20934487-1)¹³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20934487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20934481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3439 + ... + 7327.

It is an arithmetic number, because the mean of its divisors is an integer number (2995300).

Almost surely, 2^20934487 is an apocalyptic number.

20934487 is a deficient number, since it is larger than the sum of its proper divisors (3027913).

20934487 is an equidigital number, since it uses as much as digits as its factorization.

20934487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20934487 is about 4575.4220570347. The cubic root of 20934487 is about 275.6052213189.

The spelling of 20934487 in words is "twenty million, nine hundred thirty-four thousand, four hundred eighty-seven".