19976940 has 144 divisors (see below), whose sum is σ = 64864800. Its totient is φ = 4967424.

The previous prime is 19976939. The next prime is 19976947. The reversal of 19976940 is 4967991.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19976947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224416 + ... + 224504.

It is an arithmetic number, because the mean of its divisors is an integer number (450450).

Almost surely, 2^19976940 is an apocalyptic number.

19976940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19976940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32432400).

19976940 is an abundant number, since it is smaller than the sum of its proper divisors (44887860).

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

19976940 is a wasteful number, since it uses less digits than its factorization.

19976940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19976940 is about 4469.5570250306. The cubic root of 19976940 is about 271.3373974215.

It can be divided in two parts, 199769 and 40, that added together give a square (199809 = 447²).

The spelling of 19976940 in words is "nineteen million, nine hundred seventy-six thousand, nine hundred forty".