20379977 has 2 divisors, whose sum is σ = 20379978. Its totient is φ = 20379976.

The previous prime is 20379973. The next prime is 20380033. The reversal of 20379977 is 77997302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 808201 = 4424^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 20379977 - 2² = 20379973 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20379971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189988 + 10189989.

It is an arithmetic number, because the mean of its divisors is an integer number (10189989).

Almost surely, 2^20379977 is an apocalyptic number.

It is an amenable number.

20379977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20379977 is an equidigital number, since it uses as much as digits as its factorization.

20379977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 20379977 is about 4514.4187887257. The cubic root of 20379977 is about 273.1500157221.

The spelling of 20379977 in words is "twenty million, three hundred seventy-nine thousand, nine hundred seventy-seven".