20423767 has 16 divisors (see below), whose sum is σ = 25392640. Its totient is φ = 15995232.

The previous prime is 20423719. The next prime is 20423771. The reversal of 20423767 is 76732402.

It is a happy number.

It is a 5-Lehmer number, since φ(20423767) divides (20423767-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 20423767 - 2⁷ = 20423639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8284 + ... + 10462.

It is an arithmetic number, because the mean of its divisors is an integer number (1587040).

Almost surely, 2^20423767 is an apocalyptic number.

20423767 is a deficient number, since it is larger than the sum of its proper divisors (4968873).

20423767 is a wasteful number, since it uses less digits than its factorization.

20423767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 20423767 is about 4519.2662014978. The cubic root of 20423767 is about 273.3455128752.

It can be divided in two parts, 204237 and 67, that added together give a square (204304 = 452²).

The spelling of 20423767 in words is "twenty million, four hundred twenty-three thousand, seven hundred sixty-seven".