19697254920 has 256 divisors, whose sum is σ = 77458636800. Its totient is φ = 4356944640.

The previous prime is 19697254883. The next prime is 19697254921. The reversal of 19697254920 is 2945279691.

19697254920 is a `hidden beast` number, since 1 + 9 + 6 + 9 + 72 + 549 + 20 = 666.

It is a Smith number, since the sum of its digits (54) 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 (54).

It is not an unprimeable number, because it can be changed into a prime (19697254921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 192337 + ... + 276383.

It is an arithmetic number, because the mean of its divisors is an integer number (302572800).

Almost surely, 2^19697254920 is an apocalyptic number.

19697254920 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 19697254920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38729318400).

19697254920 is an abundant number, since it is smaller than the sum of its proper divisors (57761381880).

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

19697254920 is a wasteful number, since it uses less digits than its factorization.

19697254920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84105 (or 84095 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 19697254920 in words is "nineteen billion, six hundred ninety-seven million, two hundred fifty-four thousand, nine hundred twenty".