20257623990 has 128 divisors (see below), whose sum is σ = 55465482240. Its totient is φ = 5258131200.

The previous prime is 20257623989. The next prime is 20257624039. The reversal of 20257623990 is 9932675202.

It is a happy number.

20257623990 is a `hidden beast` number, since 2 + 0 + 257 + 6 + 2 + 399 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 5433507 + ... + 5437233.

It is an arithmetic number, because the mean of its divisors is an integer number (433324080).

Almost surely, 2^20257623990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20257623990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27732741120).

20257623990 is an abundant number, since it is smaller than the sum of its proper divisors (35207858250).

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

20257623990 is a wasteful number, since it uses less digits than its factorization.

20257623990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275 (or 4269 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 20257623990 in words is "twenty billion, two hundred fifty-seven million, six hundred twenty-three thousand, nine hundred ninety".