20071949 has 4 divisors (see below), whose sum is σ = 20085120. Its totient is φ = 20058780.

The previous prime is 20071921. The next prime is 20071963. The reversal of 20071949 is 94917002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94917002 = 2 ⋅47458501.

It is a cyclic number.

It is not a de Polignac number, because 20071949 - 2⁸ = 20071693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20061949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3947 + ... + 7464.

It is an arithmetic number, because the mean of its divisors is an integer number (5021280).

Almost surely, 2^20071949 is an apocalyptic number.

It is an amenable number.

20071949 is a deficient number, since it is larger than the sum of its proper divisors (13171).

20071949 is a wasteful number, since it uses less digits than its factorization.

20071949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20071949 is about 4480.1728761288. The cubic root of 20071949 is about 271.7668715036.

The spelling of 20071949 in words is "twenty million, seventy-one thousand, nine hundred forty-nine".