20781234510 has 64 divisors (see below), whose sum is σ = 50225398272. Its totient is φ = 5502796416.

The previous prime is 20781234499. The next prime is 20781234527. The reversal of 20781234510 is 1543218702.

It is a super-2 number, since 2×20781234510² (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 in 31 ways as a sum of consecutive naturals, for example, 7428432 + ... + 7431228.

It is an arithmetic number, because the mean of its divisors is an integer number (784771848).

Almost surely, 2^20781234510 is an apocalyptic number.

20781234510 is an abundant number, since it is smaller than the sum of its proper divisors (29444163762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20781234510 is a wasteful number, since it uses less digits than its factorization.

20781234510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 20781234510 in words is "twenty billion, seven hundred eighty-one million, two hundred thirty-four thousand, five hundred ten".