19685972 has 6 divisors (see below), whose sum is σ = 34450458. Its totient is φ = 9842984.

The previous prime is 19685969. The next prime is 19685977. The reversal of 19685972 is 27958691.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 1674436 = 4244^2 + 1294^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19685977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460743 + ... + 2460750.

It is an arithmetic number, because the mean of its divisors is an integer number (5741743).

Almost surely, 2^19685972 is an apocalyptic number.

It is an amenable number.

19685972 is a deficient number, since it is larger than the sum of its proper divisors (14764486).

19685972 is a wasteful number, since it uses less digits than its factorization.

19685972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921497 (or 4921495 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 19685972 is about 4436.8876478901. The cubic root of 19685972 is about 270.0135887079.

It can be divided in two parts, 196 and 85972, that added together give a palindrome (86168).

The spelling of 19685972 in words is "nineteen million, six hundred eighty-five thousand, nine hundred seventy-two".