20427619947 has 96 divisors (see below), whose sum is σ = 34323886080. Its totient is φ = 10746711360.

The previous prime is 20427619939. The next prime is 20427619957. The reversal of 20427619947 is 74991672402.

It is not a de Polignac number, because 20427619947 - 2³ = 20427619939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20427619947.

It is not an unprimeable number, because it can be changed into a prime (20427619937) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10321204 + ... + 10323182.

It is an arithmetic number, because the mean of its divisors is an integer number (357540480).

Almost surely, 2^20427619947 is an apocalyptic number.

20427619947 is a deficient number, since it is larger than the sum of its proper divisors (13896266133).

20427619947 is a wasteful number, since it uses less digits than its factorization.

20427619947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133 (or 2126 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 20427619947 in words is "twenty billion, four hundred twenty-seven million, six hundred nineteen thousand, nine hundred forty-seven".