20120139 has 24 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 12321792.

The previous prime is 20120081. The next prime is 20120143. The reversal of 20120139 is 93102102.

It is a happy number.

It is not a de Polignac number, because 20120139 - 2¹³ = 20111947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20120189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44587 + ... + 45035.

It is an arithmetic number, because the mean of its divisors is an integer number (1310400).

Almost surely, 2^20120139 is an apocalyptic number.

20120139 is a deficient number, since it is larger than the sum of its proper divisors (11329461).

20120139 is a wasteful number, since it uses less digits than its factorization.

20120139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20120139 is about 4485.5477926336. The cubic root of 20120139 is about 271.9841893564.

The spelling of 20120139 in words is "twenty million, one hundred twenty thousand, one hundred thirty-nine".