19945156 has 81 divisors (see below), whose sum is σ = 46221357. Its totient is φ = 7502880.

The previous prime is 19945153. The next prime is 19945171. The reversal of 19945156 is 65154991.

19945156 = T₁₃₃ + T₁₃₄ + ... + T₄₉₅.

The square root of 19945156 is 4466.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10458756 + 9486400 = 3234^2 + 3080^2 .

It is not an unprimeable number, because it can be changed into a prime (19945151) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 687750 + ... + 687778.

Almost surely, 2^19945156 is an apocalyptic number.

19945156 is the 4466-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19945156

19945156 is an abundant number, since it is smaller than the sum of its proper divisors (26276201).

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

19945156 is a wasteful number, since it uses less digits than its factorization.

19945156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 49 counting only the distinct ones).

The product of its digits is 48600, while the sum is 40.

The cubic root of 19945156 is about 271.1934186526.

The spelling of 19945156 in words is "nineteen million, nine hundred forty-five thousand, one hundred fifty-six".