20607777021 has 24 divisors (see below), whose sum is σ = 29815706880. Its totient is φ = 12655084416.

The previous prime is 20607777011. The next prime is 20607777053. The reversal of 20607777021 is 12077770602.

It is not a de Polignac number, because 20607777021 - 2⁵ = 20607776989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20607777011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200425 + ... + 285281.

It is an arithmetic number, because the mean of its divisors is an integer number (1242321120).

Almost surely, 2^20607777021 is an apocalyptic number.

It is an amenable number.

20607777021 is a deficient number, since it is larger than the sum of its proper divisors (9207929859).

20607777021 is a wasteful number, since it uses less digits than its factorization.

20607777021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85365 (or 85352 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 39.

The spelling of 20607777021 in words is "twenty billion, six hundred seven million, seven hundred seventy-seven thousand, twenty-one".