20977078 has 8 divisors (see below), whose sum is σ = 31485168. Its totient is φ = 10482024.

The previous prime is 20977067. The next prime is 20977079. The reversal of 20977078 is 87077902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20977078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977079) 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, 4000 + ... + 7612.

It is an arithmetic number, because the mean of its divisors is an integer number (3935646).

Almost surely, 2^20977078 is an apocalyptic number.

20977078 is a deficient number, since it is larger than the sum of its proper divisors (10508090).

20977078 is a wasteful number, since it uses less digits than its factorization.

20977078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6518.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 20977078 is about 4580.0740168692. The cubic root of 20977078 is about 275.7920000456.

It can be divided in two parts, 209770 and 78, that multiplied together give a triangular number (16362060 = T₅₇₂₀).

The spelling of 20977078 in words is "twenty million, nine hundred seventy-seven thousand, seventy-eight".