20998038651 has 16 divisors (see below), whose sum is σ = 29501174400. Its totient is φ = 13248309888.

The previous prime is 20998038643. The next prime is 20998038653. The reversal of 20998038651 is 15683089902.

It is a happy number.

It is not a de Polignac number, because 20998038651 - 2³ = 20998038643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20998038594 and 20998038603.

It is not an unprimeable number, because it can be changed into a prime (20998038653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132841 + ... + 244218.

It is an arithmetic number, because the mean of its divisors is an integer number (1843823400).

Almost surely, 2^20998038651 is an apocalyptic number.

20998038651 is a deficient number, since it is larger than the sum of its proper divisors (8503135749).

20998038651 is a wasteful number, since it uses less digits than its factorization.

20998038651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378058.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 20998038651 in words is "twenty billion, nine hundred ninety-eight million, thirty-eight thousand, six hundred fifty-one".