20377861 has 32 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 15552000.

The previous prime is 20377859. The next prime is 20377867. The reversal of 20377861 is 16877302.

It is a 5-Lehmer number, since φ(20377861) divides (20377861-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 20377861 - 2¹ = 20377859 is a prime.

It is a Smith number, since the sum of its digits (34) 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 (20377867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201711 + ... + 201811.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^20377861 is an apocalyptic number.

It is an amenable number.

20377861 is a deficient number, since it is larger than the sum of its proper divisors (5668859).

20377861 is a wasteful number, since it uses less digits than its factorization.

20377861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20377861 is about 4514.1844224622. The cubic root of 20377861 is about 273.1405619097.

The spelling of 20377861 in words is "twenty million, three hundred seventy-seven thousand, eight hundred sixty-one".