20051634140 has 96 divisors (see below), whose sum is σ = 45967824000. Its totient is φ = 7323717632.

The previous prime is 20051634137. The next prime is 20051634149. The reversal of 20051634140 is 4143615002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20051634149) 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, 1178816 + ... + 1195704.

It is an arithmetic number, because the mean of its divisors is an integer number (478831500).

Almost surely, 2^20051634140 is an apocalyptic number.

20051634140 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 20051634140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22983912000).

20051634140 is an abundant number, since it is smaller than the sum of its proper divisors (25916189860).

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

20051634140 is a wasteful number, since it uses less digits than its factorization.

20051634140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17039 (or 17037 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 20051634140 in words is "twenty billion, fifty-one million, six hundred thirty-four thousand, one hundred forty".