19770156 has 120 divisors (see below), whose sum is σ = 61797120. Its totient is φ = 5388768.

The previous prime is 19770139. The next prime is 19770169. The reversal of 19770156 is 65107791.

It is a hoax number, since the sum of its digits (36) 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 (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19770156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 51975 + ... + 52353.

It is an arithmetic number, because the mean of its divisors is an integer number (514976).

Almost surely, 2^19770156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19770156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30898560).

19770156 is an abundant number, since it is smaller than the sum of its proper divisors (42026964).

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

19770156 is a wasteful number, since it uses less digits than its factorization.

19770156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 19770156 is about 4446.3643575398. The cubic root of 19770156 is about 270.3979317501.

The spelling of 19770156 in words is "nineteen million, seven hundred seventy thousand, one hundred fifty-six".