20509950938 has 16 divisors (see below), whose sum is σ = 32481990240. Its totient is φ = 9685882800.

The previous prime is 20509950847. The next prime is 20509950947. The reversal of 20509950938 is 83905990502.

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, 802733 + ... + 827888.

It is an arithmetic number, because the mean of its divisors is an integer number (2030124390).

Almost surely, 2^20509950938 is an apocalyptic number.

20509950938 is a deficient number, since it is larger than the sum of its proper divisors (11972039302).

20509950938 is a wasteful number, since it uses less digits than its factorization.

20509950938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630973.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 20509950938 in words is "twenty billion, five hundred nine million, nine hundred fifty thousand, nine hundred thirty-eight".