19774980 has 72 divisors (see below), whose sum is σ = 61001304. Its totient is φ = 5184000.

The previous prime is 19774939. The next prime is 19774981. The reversal of 19774980 is 8947791.

It can be written as a sum of positive squares in 4 ways, for example, as 695556 + 19079424 = 834^2 + 4368^2 .

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 (19774981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10080 + ... + 11880.

Almost surely, 2^19774980 is an apocalyptic number.

19774980 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 19774980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30500652).

19774980 is an abundant number, since it is smaller than the sum of its proper divisors (41226324).

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

19774980 is a wasteful number, since it uses less digits than its factorization.

19774980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 19774980 is about 4446.9067901183. The cubic root of 19774980 is about 270.4199227002.

The spelling of 19774980 in words is "nineteen million, seven hundred seventy-four thousand, nine hundred eighty".