20402124 has 48 divisors (see below), whose sum is σ = 51300480. Its totient is φ = 6289920.

The previous prime is 20402119. The next prime is 20402131. The reversal of 20402124 is 42120402.

It is a super-2 number, since 2×20402124² = 832493327422752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8764 + ... + 10844.

It is an arithmetic number, because the mean of its divisors is an integer number (1068760).

Almost surely, 2^20402124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25650240).

20402124 is an abundant number, since it is smaller than the sum of its proper divisors (30898356).

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

20402124 is a wasteful number, since it uses less digits than its factorization.

20402124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2148 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20402124 is about 4516.8710408866. The cubic root of 20402124 is about 273.2489242963.

Adding to 20402124 its reverse (42120402), we get a palindrome (62522526).

The spelling of 20402124 in words is "twenty million, four hundred two thousand, one hundred twenty-four".