19774087220 has 48 divisors (see below), whose sum is σ = 42690267648. Its totient is φ = 7690022400.

The previous prime is 19774087147. The next prime is 19774087231. The reversal of 19774087220 is 2278047791.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72284 + ... + 211596.

It is an arithmetic number, because the mean of its divisors is an integer number (889380576).

Almost surely, 2^19774087220 is an apocalyptic number.

19774087220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19774087220 is an abundant number, since it is smaller than the sum of its proper divisors (22916180428).

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

19774087220 is a wasteful number, since it uses less digits than its factorization.

19774087220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139520 (or 139518 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 19774087220 in words is "nineteen billion, seven hundred seventy-four million, eighty-seven thousand, two hundred twenty".