19772540 has 48 divisors (see below), whose sum is σ = 44476320. Its totient is φ = 7361280.

The previous prime is 19772531. The next prime is 19772549. The reversal of 19772540 is 4527791.

It is an interprime number because it is at equal distance from previous prime (19772531) and next prime (19772549).

It is a self number, because there is not a number n which added to its sum of digits gives 19772540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19772549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22754 + ... + 23606.

It is an arithmetic number, because the mean of its divisors is an integer number (926590).

Almost surely, 2^19772540 is an apocalyptic number.

19772540 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 19772540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22238160).

19772540 is an abundant number, since it is smaller than the sum of its proper divisors (24703780).

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

19772540 is a wasteful number, since it uses less digits than its factorization.

19772540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 19772540 is about 4446.6324336513. The cubic root of 19772540 is about 270.4088000299.

The spelling of 19772540 in words is "nineteen million, seven hundred seventy-two thousand, five hundred forty".