19722130 has 16 divisors (see below), whose sum is σ = 35618904. Its totient is φ = 7862400.

The previous prime is 19722119. The next prime is 19722149. The reversal of 19722130 is 3122791.

It can be written as a sum of positive squares in 4 ways, for example, as 10413529 + 9308601 = 3227^2 + 3051^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19722095 and 19722104.

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, 21 + ... + 6280.

Almost surely, 2^19722130 is an apocalyptic number.

19722130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19722130 is a deficient number, since it is larger than the sum of its proper divisors (15896774).

19722130 is a wasteful number, since it uses less digits than its factorization.

19722130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6621.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 19722130 is about 4440.9604816976. The cubic root of 19722130 is about 270.1788024615.

The spelling of 19722130 in words is "nineteen million, seven hundred twenty-two thousand, one hundred thirty".