20275137 has 16 divisors (see below), whose sum is σ = 30234880. Its totient is φ = 13427856.

The previous prime is 20275133. The next prime is 20275139. The reversal of 20275137 is 73157202.

It is not a de Polignac number, because 20275137 - 2² = 20275133 is a prime.

It is a super-2 number, since 2×20275137² = 822162360737538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20275137.

It is not an unprimeable number, because it can be changed into a prime (20275133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1848 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (1889680).

Almost surely, 2^20275137 is an apocalyptic number.

20275137 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20275137 is a deficient number, since it is larger than the sum of its proper divisors (9959743).

20275137 is a wasteful number, since it uses less digits than its factorization.

20275137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949 (or 4943 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20275137 is about 4502.7921337766. The cubic root of 20275137 is about 272.6808249082.

The spelling of 20275137 in words is "twenty million, two hundred seventy-five thousand, one hundred thirty-seven".