20437542 has 64 divisors (see below), whose sum is σ = 47770560. Its totient is φ = 6469632.

The previous prime is 20437507. The next prime is 20437577. The reversal of 20437542 is 24573402.

It is an interprime number because it is at equal distance from previous prime (20437507) and next prime (20437577).

It is a super-3 number, since 3×20437542³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105798 + ... + 105990.

It is an arithmetic number, because the mean of its divisors is an integer number (746415).

Almost surely, 2^20437542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20437542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23885280).

20437542 is an abundant number, since it is smaller than the sum of its proper divisors (27333018).

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

20437542 is a wasteful number, since it uses less digits than its factorization.

20437542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20437542 is about 4520.7899752145. The cubic root of 20437542 is about 273.4069525407.

The spelling of 20437542 in words is "twenty million, four hundred thirty-seven thousand, five hundred forty-two".