20438977 has 8 divisors (see below), whose sum is σ = 22171520. Its totient is φ = 18729360.

The previous prime is 20438933. The next prime is 20438989. The reversal of 20438977 is 77983402.

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

It is not a de Polignac number, because 20438977 - 2⁷ = 20438849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20432977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3849 + ... + 7462.

It is an arithmetic number, because the mean of its divisors is an integer number (2771440).

Almost surely, 2^20438977 is an apocalyptic number.

It is an amenable number.

20438977 is a deficient number, since it is larger than the sum of its proper divisors (1732543).

20438977 is a wasteful number, since it uses less digits than its factorization.

20438977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11463.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20438977 is about 4520.9486836282. The cubic root of 20438977 is about 273.4133513825.

The spelling of 20438977 in words is "twenty million, four hundred thirty-eight thousand, nine hundred seventy-seven".