20722506 has 16 divisors (see below), whose sum is σ = 47365824. Its totient is φ = 5920704.

The previous prime is 20722453. The next prime is 20722519. The reversal of 20722506 is 60522702.

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, 246655 + ... + 246738.

It is an arithmetic number, because the mean of its divisors is an integer number (2960364).

Almost surely, 2^20722506 is an apocalyptic number.

20722506 is an abundant number, since it is smaller than the sum of its proper divisors (26643318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20722506 is a wasteful number, since it uses less digits than its factorization.

20722506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493405.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20722506 is about 4552.1979306704. The cubic root of 20722506 is about 274.6718112457.

The spelling of 20722506 in words is "twenty million, seven hundred twenty-two thousand, five hundred six".