20462991 has 8 divisors (see below), whose sum is σ = 27414144. Its totient is φ = 13576920.

The previous prime is 20462983. The next prime is 20462993. The reversal of 20462991 is 19926402.

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

It is not a de Polignac number, because 20462991 - 2³ = 20462983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20462993) 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, 15531 + ... + 16796.

It is an arithmetic number, because the mean of its divisors is an integer number (3426768).

Almost surely, 2^20462991 is an apocalyptic number.

20462991 is a deficient number, since it is larger than the sum of its proper divisors (6951153).

20462991 is a wasteful number, since it uses less digits than its factorization.

20462991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32541.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20462991 is about 4523.6037624885. The cubic root of 20462991 is about 273.5203883525.

The spelling of 20462991 in words is "twenty million, four hundred sixty-two thousand, nine hundred ninety-one".