20287603778 has 32 divisors (see below), whose sum is σ = 33004564992. Its totient is φ = 9297288000.

The previous prime is 20287603727. The next prime is 20287603783. The reversal of 20287603778 is 87730678202.

It is a super-3 number, since 3×20287603778³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4095203 + ... + 4100153.

It is an arithmetic number, because the mean of its divisors is an integer number (1031392656).

Almost surely, 2^20287603778 is an apocalyptic number.

20287603778 is a deficient number, since it is larger than the sum of its proper divisors (12716961214).

20287603778 is a wasteful number, since it uses less digits than its factorization.

20287603778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 20287603778 in words is "twenty billion, two hundred eighty-seven million, six hundred three thousand, seven hundred seventy-eight".