20722148 has 6 divisors (see below), whose sum is σ = 36263766. Its totient is φ = 10361072.

The previous prime is 20722129. The next prime is 20722171. The reversal of 20722148 is 84122702.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 1444 = 4552^2 + 38^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590265 + ... + 2590272.

It is an arithmetic number, because the mean of its divisors is an integer number (6043961).

Almost surely, 2^20722148 is an apocalyptic number.

It is an amenable number.

20722148 is a deficient number, since it is larger than the sum of its proper divisors (15541618).

20722148 is a wasteful number, since it uses less digits than its factorization.

20722148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180541 (or 5180539 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20722148 is about 4552.1586088360. The cubic root of 20722148 is about 274.6702295021.

The spelling of 20722148 in words is "twenty million, seven hundred twenty-two thousand, one hundred forty-eight".