20577788 has 48 divisors (see below), whose sum is σ = 45577728. Its totient is φ = 7896000.

The previous prime is 20577773. The next prime is 20577829. The reversal of 20577788 is 88777502.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21398 + ... + 22338.

It is an arithmetic number, because the mean of its divisors is an integer number (949536).

Almost surely, 2^20577788 is an apocalyptic number.

20577788 is a gapful number since it is divisible by the number (28) 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 20577788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22788864).

20577788 is an abundant number, since it is smaller than the sum of its proper divisors (24999940).

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

20577788 is a wasteful number, since it uses less digits than its factorization.

20577788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 20577788 is about 4536.2746830411. The cubic root of 20577788 is about 274.0309162906.

The spelling of 20577788 in words is "twenty million, five hundred seventy-seven thousand, seven hundred eighty-eight".