20750139 has 12 divisors (see below), whose sum is σ = 30147936. Its totient is φ = 13752432.

The previous prime is 20750131. The next prime is 20750153. The reversal of 20750139 is 93105702.

It is not a de Polignac number, because 20750139 - 2³ = 20750131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20750131) 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, 5107 + ... + 8220.

It is an arithmetic number, because the mean of its divisors is an integer number (2512328).

Almost surely, 2^20750139 is an apocalyptic number.

20750139 is a deficient number, since it is larger than the sum of its proper divisors (9397797).

20750139 is a wasteful number, since it uses less digits than its factorization.

20750139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13506 (or 13503 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20750139 is about 4555.2320467787. The cubic root of 20750139 is about 274.7938465979.

The spelling of 20750139 in words is "twenty million, seven hundred fifty thousand, one hundred thirty-nine".