20987435810 has 16 divisors (see below), whose sum is σ = 41211692352. Its totient is φ = 7631794800.

The previous prime is 20987435783. The next prime is 20987435827. The reversal of 20987435810 is 1853478902.

It is a happy number.

It is a super-2 number, since 2×20987435810² (a number of 21 digits) contains 22 as substring.

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, 95397326 + ... + 95397545.

It is an arithmetic number, because the mean of its divisors is an integer number (2575730772).

Almost surely, 2^20987435810 is an apocalyptic number.

20987435810 is a deficient number, since it is larger than the sum of its proper divisors (20224256542).

20987435810 is a wasteful number, since it uses less digits than its factorization.

20987435810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190794889.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20987435810 in words is "twenty billion, nine hundred eighty-seven million, four hundred thirty-five thousand, eight hundred ten".