20342920 has 128 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 6773760.

The previous prime is 20342911. The next prime is 20342921. The reversal of 20342920 is 2924302.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20342891 and 20342900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342921) 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, 286485 + ... + 286555.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

It is a vampire number, since it can be written as 2204 ⋅ 9230 (with its own digits).

Almost surely, 2^20342920 is an apocalyptic number.

20342920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20342920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

20342920 is an abundant number, since it is smaller than the sum of its proper divisors (34089080).

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

20342920 is a wasteful number, since it uses less digits than its factorization.

20342920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20342920 is about 4510.3126277454. The cubic root of 20342920 is about 272.9843586596.

The spelling of 20342920 in words is "twenty million, three hundred forty-two thousand, nine hundred twenty".