20039893477 has 4 divisors (see below), whose sum is σ = 20080708416. Its totient is φ = 19999078540.

The previous prime is 20039893459. The next prime is 20039893483. The reversal of 20039893477 is 77439893002.

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 20039893477 - 2²³ = 20031504869 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 (20039893877) 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, 20406733 + ... + 20407714.

It is an arithmetic number, because the mean of its divisors is an integer number (5020177104).

Almost surely, 2^20039893477 is an apocalyptic number.

It is an amenable number.

20039893477 is a deficient number, since it is larger than the sum of its proper divisors (40814939).

20039893477 is an equidigital number, since it uses as much as digits as its factorization.

20039893477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40814938.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 20039893477 in words is "twenty billion, thirty-nine million, eight hundred ninety-three thousand, four hundred seventy-seven".