20766542 has 4 divisors (see below), whose sum is σ = 31149816. Its totient is φ = 10383270.

The previous prime is 20766533. The next prime is 20766593. The reversal of 20766542 is 24566702.

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

It is a junction number, because it is equal to n+sod(n) for n = 20766499 and 20766508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5191634 + ... + 5191637.

It is an arithmetic number, because the mean of its divisors is an integer number (7787454).

Almost surely, 2^20766542 is an apocalyptic number.

20766542 is a deficient number, since it is larger than the sum of its proper divisors (10383274).

20766542 is a wasteful number, since it uses less digits than its factorization.

20766542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10383273.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20766542 is about 4557.0321482298. The cubic root of 20766542 is about 274.8662357720.

The spelling of 20766542 in words is "twenty million, seven hundred sixty-six thousand, five hundred forty-two".