20253977 has 4 divisors (see below), whose sum is σ = 20952420. Its totient is φ = 19555536.

The previous prime is 20253973. The next prime is 20253979. The reversal of 20253977 is 77935202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77935202 = 2 ⋅38967601.

It can be written as a sum of positive squares in 2 ways, for example, as 5973136 + 14280841 = 2444^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20253977 - 2² = 20253973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20253971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349178 + ... + 349235.

It is an arithmetic number, because the mean of its divisors is an integer number (5238105).

Almost surely, 2^20253977 is an apocalyptic number.

It is an amenable number.

20253977 is a deficient number, since it is larger than the sum of its proper divisors (698443).

20253977 is an equidigital number, since it uses as much as digits as its factorization.

20253977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698442.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 20253977 is about 4500.4418671948. The cubic root of 20253977 is about 272.5859314324.

The spelling of 20253977 in words is "twenty million, two hundred fifty-three thousand, nine hundred seventy-seven".