20422477 has 8 divisors (see below), whose sum is σ = 20769336. Its totient is φ = 20078592.

The previous prime is 20422447. The next prime is 20422499. The reversal of 20422477 is 77422402.

It can be written as a sum of positive squares in 4 ways, for example, as 5103081 + 15319396 = 2259^2 + 3914^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20422477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16173 + ... + 17389.

It is an arithmetic number, because the mean of its divisors is an integer number (2596167).

Almost surely, 2^20422477 is an apocalyptic number.

It is an amenable number.

20422477 is a deficient number, since it is larger than the sum of its proper divisors (346859).

20422477 is a wasteful number, since it uses less digits than its factorization.

20422477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 20422477 is about 4519.1234769588. The cubic root of 20422477 is about 273.3397577643.

Adding to 20422477 its reverse (77422402), we get a palindrome (97844879).

The spelling of 20422477 in words is "twenty million, four hundred twenty-two thousand, four hundred seventy-seven".