20419999887 has 32 divisors (see below), whose sum is σ = 31660070400. Its totient is φ = 11464823808.

The previous prime is 20419999879. The next prime is 20419999891. The reversal of 20419999887 is 78899991402.

It is not a de Polignac number, because 20419999887 - 2³ = 20419999879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20419999867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3586539 + ... + 3592227.

It is an arithmetic number, because the mean of its divisors is an integer number (989377200).

Almost surely, 2^20419999887 is an apocalyptic number.

20419999887 is a deficient number, since it is larger than the sum of its proper divisors (11240070513).

20419999887 is a wasteful number, since it uses less digits than its factorization.

20419999887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8655.

The product of its (nonzero) digits is 23514624, while the sum is 66.

It can be divided in two parts, 20419 and 999887, that added together give a triangular number (1020306 = T₁₄₂₈).

The spelling of 20419999887 in words is "twenty billion, four hundred nineteen million, nine hundred ninety-nine thousand, eight hundred eighty-seven".