20268951838 has 4 divisors (see below), whose sum is σ = 30403427760. Its totient is φ = 10134475918.

The previous prime is 20268951821. The next prime is 20268951887. The reversal of 20268951838 is 83815986202.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20268951838² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5067237958 + ... + 5067237961.

It is an arithmetic number, because the mean of its divisors is an integer number (7600856940).

Almost surely, 2^20268951838 is an apocalyptic number.

20268951838 is a deficient number, since it is larger than the sum of its proper divisors (10134475922).

20268951838 is a wasteful number, since it uses less digits than its factorization.

20268951838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10134475921.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 20268951838 in words is "twenty billion, two hundred sixty-eight million, nine hundred fifty-one thousand, eight hundred thirty-eight".