20400077 has 8 divisors (see below), whose sum is σ = 21265920. Its totient is φ = 19547280.

The previous prime is 20400059. The next prime is 20400089. The reversal of 20400077 is 77000402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400077 - 2⁶ = 20400013 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 (20400277) 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, 2 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (2658240).

Almost surely, 2^20400077 is an apocalyptic number.

It is an amenable number.

20400077 is a deficient number, since it is larger than the sum of its proper divisors (865843).

20400077 is a wasteful number, since it uses less digits than its factorization.

20400077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6523.

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 20400077 is about 4516.6444402897. The cubic root of 20400077 is about 273.2397853907.

Adding to 20400077 its reverse (77000402), we get a palindrome (97400479).

The spelling of 20400077 in words is "twenty million, four hundred thousand, seventy-seven".