20403077 has 8 divisors (see below), whose sum is σ = 21827736. Its totient is φ = 19003392.

The previous prime is 20403073. The next prime is 20403083. The reversal of 20403077 is 77030402.

It can be written as a sum of positive squares in 4 ways, for example, as 5044516 + 15358561 = 2246^2 + 3919^2 .

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 20403077 - 2² = 20403073 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 (20403073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4538 + ... + 7835.

It is an arithmetic number, because the mean of its divisors is an integer number (2728467).

Almost surely, 2^20403077 is an apocalyptic number.

It is an amenable number.

20403077 is a deficient number, since it is larger than the sum of its proper divisors (1424659).

20403077 is a wasteful number, since it uses less digits than its factorization.

20403077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12487.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20403077 is about 4516.9765330362. The cubic root of 20403077 is about 273.2531787907.

Adding to 20403077 its reverse (77030402), we get a palindrome (97433479).

The spelling of 20403077 in words is "twenty million, four hundred three thousand, seventy-seven".