19745064 has 24 divisors (see below), whose sum is σ = 53476410.
Its totient is φ = 6581664.
The previous prime is 19745051. The next prime is 19745069. The reversal of 19745064 is 46054791.
It can be written as a sum of positive squares in only one way, i.e., 18404100 + 1340964 = 4290^2 + 1158^2
It is a tau number, because it is divible by the number of its divisors (24).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is not an unprimeable number, because it can be changed into a prime (19745069) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137047 + ... + 137190.
Almost surely, 219745064 is an apocalyptic number.
It is an amenable number.
19745064 is an abundant number, since it is smaller than the sum of its proper divisors (33731346).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19745064 is a wasteful number, since it uses less digits than its factorization.
19745064 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 274249 (or 274242 counting only the distinct ones).
The product of its (nonzero) digits is 30240, while the sum is 36.
The square root of 19745064 is about 4443.5418305671.
The cubic root of 19745064 is about 270.2834882537.
The spelling of 19745064 in words is "nineteen million, seven hundred forty-five thousand, sixty-four".