20479887 has 12 divisors (see below), whose sum is σ = 30602520. Its totient is φ = 13182288.

The previous prime is 20479859. The next prime is 20479897. The reversal of 20479887 is 78897402.

It is not a de Polignac number, because 20479887 - 2⁸ = 20479631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38973 + ... + 39494.

It is an arithmetic number, because the mean of its divisors is an integer number (2550210).

Almost surely, 2^20479887 is an apocalyptic number.

20479887 is a deficient number, since it is larger than the sum of its proper divisors (10122633).

20479887 is a wasteful number, since it uses less digits than its factorization.

20479887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78502 (or 78499 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 20479887 is about 4525.4709147226. The cubic root of 20479887 is about 273.5956482713.

The spelling of 20479887 in words is "twenty million, four hundred seventy-nine thousand, eight hundred eighty-seven".