20625401550 has 96 divisors (see below), whose sum is σ = 57985038720. Its totient is φ = 4809801600.

The previous prime is 20625401519. The next prime is 20625401561. The reversal of 20625401550 is 5510452602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 241296 + ... + 315395.

It is an arithmetic number, because the mean of its divisors is an integer number (604010820).

Almost surely, 2^20625401550 is an apocalyptic number.

20625401550 is an abundant number, since it is smaller than the sum of its proper divisors (37359637170).

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

20625401550 is a wasteful number, since it uses less digits than its factorization.

20625401550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556738 (or 556733 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 20625401550 in words is "twenty billion, six hundred twenty-five million, four hundred one thousand, five hundred fifty".