20977942 has 8 divisors (see below), whose sum is σ = 31630536. Its totient is φ = 10434432.

The previous prime is 20977889. The next prime is 20977951. The reversal of 20977942 is 24977902.

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

It is a junction number, because it is equal to n+sod(n) for n = 20977895 and 20977904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26788 + ... + 27559.

It is an arithmetic number, because the mean of its divisors is an integer number (3953817).

Almost surely, 2^20977942 is an apocalyptic number.

20977942 is a deficient number, since it is larger than the sum of its proper divisors (10652594).

20977942 is a wasteful number, since it uses less digits than its factorization.

20977942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54542.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 20977942 is about 4580.1683375177. The cubic root of 20977942 is about 275.7957864169.

Subtracting from 20977942 its sum of digits (40), we obtain a palindrome (20977902).

The spelling of 20977942 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred forty-two".