20842725 has 12 divisors (see below), whose sum is σ = 34460096. Its totient is φ = 11116080.

The previous prime is 20842721. The next prime is 20842733. The reversal of 20842725 is 52724802.

20842725 = T₃₁₃ + T₃₁₄ + ... + T₅₃₇.

It is not a de Polignac number, because 20842725 - 2² = 20842721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20842692 and 20842701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842721) 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, 138877 + ... + 139026.

Almost surely, 2^20842725 is an apocalyptic number.

20842725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20842725 is a deficient number, since it is larger than the sum of its proper divisors (13617371).

20842725 is a wasteful number, since it uses less digits than its factorization.

20842725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277916 (or 277911 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20842725 is about 4565.3833354933. The cubic root of 20842725 is about 275.2019453297.

The spelling of 20842725 in words is "twenty million, eight hundred forty-two thousand, seven hundred twenty-five".