20101400028 has 72 divisors (see below), whose sum is σ = 51793153776. Its totient is φ = 6571699200.

The previous prime is 20101400027. The next prime is 20101400041. The reversal of 20101400028 is 82000410102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101400023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 762223 + ... + 788153.

It is an arithmetic number, because the mean of its divisors is an integer number (719349358).

Almost surely, 2^20101400028 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 20101400028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25896576888).

20101400028 is an abundant number, since it is smaller than the sum of its proper divisors (31691753748).

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

20101400028 is a wasteful number, since it uses less digits than its factorization.

20101400028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26355 (or 26350 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The spelling of 20101400028 in words is "twenty billion, one hundred one million, four hundred thousand, twenty-eight".