20722463 has 4 divisors (see below), whose sum is σ = 20885760. Its totient is φ = 20559168.

The previous prime is 20722453. The next prime is 20722519. The reversal of 20722463 is 36422702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20722463 - 2⁴ = 20722447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722433) 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, 81458 + ... + 81711.

It is an arithmetic number, because the mean of its divisors is an integer number (5221440).

Almost surely, 2^20722463 is an apocalyptic number.

20722463 is a deficient number, since it is larger than the sum of its proper divisors (163297).

20722463 is a wasteful number, since it uses less digits than its factorization.

20722463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163296.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20722463 is about 4552.1932076747. The cubic root of 20722463 is about 274.6716212607.

The spelling of 20722463 in words is "twenty million, seven hundred twenty-two thousand, four hundred sixty-three".