20399977 has 8 divisors (see below), whose sum is σ = 23125760. Its totient is φ = 17839440.

The previous prime is 20399969. The next prime is 20399993. The reversal of 20399977 is 77999302.

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 20399977 - 2³ = 20399969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20399947) 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, 41049 + ... + 41542.

It is an arithmetic number, because the mean of its divisors is an integer number (2890720).

Almost surely, 2^20399977 is an apocalyptic number.

It is an amenable number.

20399977 is a deficient number, since it is larger than the sum of its proper divisors (2725783).

20399977 is a wasteful number, since it uses less digits than its factorization.

20399977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82623.

The product of its (nonzero) digits is 214326, while the sum is 46.

The square root of 20399977 is about 4516.6333701110. The cubic root of 20399977 is about 273.2393389214.

The spelling of 20399977 in words is "twenty million, three hundred ninety-nine thousand, nine hundred seventy-seven".