20628981400 has 48 divisors (see below), whose sum is σ = 47974608000. Its totient is φ = 8249489280.

The previous prime is 20628981383. The next prime is 20628981407. The reversal of 20628981400 is 418982602.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628981407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 949054 + ... + 970546.

It is an arithmetic number, because the mean of its divisors is an integer number (999471000).

Almost surely, 2^20628981400 is an apocalyptic number.

20628981400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20628981400 is an abundant number, since it is smaller than the sum of its proper divisors (27345626600).

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

20628981400 is a wasteful number, since it uses less digits than its factorization.

20628981400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26308 (or 26299 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 20628981400 in words is "twenty billion, six hundred twenty-eight million, nine hundred eighty-one thousand, four hundred".