20377961 has 2 divisors, whose sum is σ = 20377962. Its totient is φ = 20377960.

The previous prime is 20377949. The next prime is 20377979. The reversal of 20377961 is 16977302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 3444736 = 4115^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 20377961 - 2¹⁸ = 20115817 is a prime.

It is a super-2 number, since 2×20377961² = 830522589035042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20377561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188980 + 10188981.

It is an arithmetic number, because the mean of its divisors is an integer number (10188981).

Almost surely, 2^20377961 is an apocalyptic number.

It is an amenable number.

20377961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377961 is an equidigital number, since it uses as much as digits as its factorization.

20377961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20377961 is about 4514.1954986465. The cubic root of 20377961 is about 273.1410087020.

The spelling of 20377961 in words is "twenty million, three hundred seventy-seven thousand, nine hundred sixty-one".