20277081 has 32 divisors (see below), whose sum is σ = 33292800. Its totient is φ = 12093840.

The previous prime is 20277077. The next prime is 20277091. The reversal of 20277081 is 18077202.

It is not a de Polignac number, because 20277081 - 2² = 20277077 is a prime.

It is a super-2 number, since 2×20277081² = 822320027761122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20277011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19390 + ... + 20408.

It is an arithmetic number, because the mean of its divisors is an integer number (1040400).

Almost surely, 2^20277081 is an apocalyptic number.

It is an amenable number.

20277081 is a deficient number, since it is larger than the sum of its proper divisors (13015719).

20277081 is a wasteful number, since it uses less digits than its factorization.

20277081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20277081 is about 4503.0079946631. The cubic root of 20277081 is about 272.6895395979.

The spelling of 20277081 in words is "twenty million, two hundred seventy-seven thousand, eighty-one".