20979526 has 4 divisors (see below), whose sum is σ = 31469292. Its totient is φ = 10489762.

The previous prime is 20979521. The next prime is 20979533. The reversal of 20979526 is 62597902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20979526² = 880281022369352, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5244880 + ... + 5244883.

It is an arithmetic number, because the mean of its divisors is an integer number (7867323).

Almost surely, 2^20979526 is an apocalyptic number.

20979526 is a deficient number, since it is larger than the sum of its proper divisors (10489766).

20979526 is a wasteful number, since it uses less digits than its factorization.

20979526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10489765.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 20979526 is about 4580.3412536622. The cubic root of 20979526 is about 275.8027278275.

The spelling of 20979526 in words is "twenty million, nine hundred seventy-nine thousand, five hundred twenty-six".