20767842 has 12 divisors (see below), whose sum is σ = 44997030. Its totient is φ = 6922608.

The previous prime is 20767837. The next prime is 20767847. The reversal of 20767842 is 24876702.

It is an interprime number because it is at equal distance from previous prime (20767837) and next prime (20767847).

It can be written as a sum of positive squares in only one way, i.e., 15610401 + 5157441 = 3951^2 + 2271^2 .

It is a super-2 number, since 2×20767842² = 862606522673928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20767797 and 20767806.

It is not an unprimeable number, because it can be changed into a prime (20767847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576867 + ... + 576902.

Almost surely, 2^20767842 is an apocalyptic number.

20767842 is an abundant number, since it is smaller than the sum of its proper divisors (24229188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20767842 is a wasteful number, since it uses less digits than its factorization.

20767842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153777 (or 1153774 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20767842 is about 4557.1747826916. The cubic root of 20767842 is about 274.8719712583.

It can be divided in two parts, 20767 and 842, that added together give a square (21609 = 147²).

The spelling of 20767842 in words is "twenty million, seven hundred sixty-seven thousand, eight hundred forty-two".