20990622697 has 4 divisors (see below), whose sum is σ = 22898861136. Its totient is φ = 19082384260.

The previous prime is 20990622643. The next prime is 20990622703. The reversal of 20990622697 is 79622609902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20990622697 - 2¹¹ = 20990620649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20990622607) 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, 954119203 + ... + 954119224.

It is an arithmetic number, because the mean of its divisors is an integer number (5724715284).

Almost surely, 2^20990622697 is an apocalyptic number.

It is an amenable number.

20990622697 is a deficient number, since it is larger than the sum of its proper divisors (1908238439).

20990622697 is a wasteful number, since it uses less digits than its factorization.

20990622697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908238438.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 20990622697 in words is "twenty billion, nine hundred ninety million, six hundred twenty-two thousand, six hundred ninety-seven".