20501744870 has 16 divisors (see below), whose sum is σ = 37422904608. Its totient is φ = 8085194880.

The previous prime is 20501744867. The next prime is 20501744891. The reversal of 20501744870 is 7844710502.

It is a congruent number.

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, 14437139 + ... + 14438558.

It is an arithmetic number, because the mean of its divisors is an integer number (2338931538).

Almost surely, 2^20501744870 is an apocalyptic number.

20501744870 is a deficient number, since it is larger than the sum of its proper divisors (16921159738).

20501744870 is a wasteful number, since it uses less digits than its factorization.

20501744870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28875775.

The product of its (nonzero) digits is 62720, while the sum is 38.

The spelling of 20501744870 in words is "twenty billion, five hundred one million, seven hundred forty-four thousand, eight hundred seventy".