20215666834 has 16 divisors (see below), whose sum is σ = 33173906400. Its totient is φ = 9162904960.

The previous prime is 20215666829. The next prime is 20215666847. The reversal of 20215666834 is 43866651202.

20215666834 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1293784 + ... + 1309315.

It is an arithmetic number, because the mean of its divisors is an integer number (2073369150).

Almost surely, 2^20215666834 is an apocalyptic number.

20215666834 is a deficient number, since it is larger than the sum of its proper divisors (12958239566).

20215666834 is a wasteful number, since it uses less digits than its factorization.

20215666834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603465.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 20215666834 in words is "twenty billion, two hundred fifteen million, six hundred sixty-six thousand, eight hundred thirty-four".