20777425 has 12 divisors (see below), whose sum is σ = 25913520. Its totient is φ = 16525520.

The previous prime is 20777413. The next prime is 20777429. The reversal of 20777425 is 52477702.

It is not a de Polignac number, because 20777425 - 2¹³ = 20769233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20777429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2154 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (2159460).

Almost surely, 2^20777425 is an apocalyptic number.

20777425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20777425 is a deficient number, since it is larger than the sum of its proper divisors (5136095).

20777425 is a wasteful number, since it uses less digits than its factorization.

20777425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832 (or 4827 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 20777425 is about 4558.2260803957. The cubic root of 20777425 is about 274.9142432326.

The spelling of 20777425 in words is "twenty million, seven hundred seventy-seven thousand, four hundred twenty-five".