20801299931 has 4 divisors (see below), whose sum is σ = 20928915432. Its totient is φ = 20673684432.

The previous prime is 20801299913. The next prime is 20801299933. The reversal of 20801299931 is 13999210802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13999210802 = 2 ⋅6999605401.

It is a cyclic number.

It is not a de Polignac number, because 20801299931 - 2²² = 20797105627 is a prime.

It is a super-2 number, since 2×20801299931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20801299933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63807506 + ... + 63807831.

It is an arithmetic number, because the mean of its divisors is an integer number (5232228858).

Almost surely, 2^20801299931 is an apocalyptic number.

20801299931 is a deficient number, since it is larger than the sum of its proper divisors (127615501).

20801299931 is a wasteful number, since it uses less digits than its factorization.

20801299931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127615500.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 20801299931 in words is "twenty billion, eight hundred one million, two hundred ninety-nine thousand, nine hundred thirty-one".