19954757620 has 24 divisors (see below), whose sum is σ = 47891418624. Its totient is φ = 6841631136.

The previous prime is 19954757593. The next prime is 19954757623. The reversal of 19954757620 is 2675745991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19954757623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71266852 + ... + 71267131.

It is an arithmetic number, because the mean of its divisors is an integer number (1995475776).

Almost surely, 2^19954757620 is an apocalyptic number.

19954757620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19954757620 is an abundant number, since it is smaller than the sum of its proper divisors (27936661004).

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

19954757620 is a wasteful number, since it uses less digits than its factorization.

19954757620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142533999 (or 142533997 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 19954757620 in words is "nineteen billion, nine hundred fifty-four million, seven hundred fifty-seven thousand, six hundred twenty".