20403123000 has 256 divisors, whose sum is σ = 70019389440. Its totient is φ = 4915008000.

The previous prime is 20403122983. The next prime is 20403123017. The reversal of 20403123000 is 32130402.

It is an interprime number because it is at equal distance from previous prime (20403122983) and next prime (20403123017).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1827435 + ... + 1838565.

It is an arithmetic number, because the mean of its divisors is an integer number (273513240).

Almost surely, 2^20403123000 is an apocalyptic number.

20403123000 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 20403123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35009694720).

20403123000 is an abundant number, since it is smaller than the sum of its proper divisors (49616266440).

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

20403123000 is a wasteful number, since it uses less digits than its factorization.

20403123000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11215 (or 11201 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 20403123000 its reverse (32130402), we get a palindrome (20435253402).

The spelling of 20403123000 in words is "twenty billion, four hundred three million, one hundred twenty-three thousand".