20577671520 has 288 divisors, whose sum is σ = 78005138400. Its totient is φ = 4541128704.

The previous prime is 20577671501. The next prime is 20577671537. The reversal of 20577671520 is 2517677502.

It is a super-2 number, since 2×20577671520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 666996 + ... + 697164.

It is an arithmetic number, because the mean of its divisors is an integer number (270851175).

Almost surely, 2^20577671520 is an apocalyptic number.

20577671520 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 20577671520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39002569200).

20577671520 is an abundant number, since it is smaller than the sum of its proper divisors (57427466880).

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

20577671520 is a wasteful number, since it uses less digits than its factorization.

20577671520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30230 (or 30215 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 20577671520 in words is "twenty billion, five hundred seventy-seven million, six hundred seventy-one thousand, five hundred twenty".