20977902 has 48 divisors (see below), whose sum is σ = 50122800. Its totient is φ = 6288000.

The previous prime is 20977889. The next prime is 20977951.

20977902 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19474 + ... + 20522.

It is an arithmetic number, because the mean of its divisors is an integer number (1044225).

Almost surely, 2^20977902 is an apocalyptic number.

20977902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20977902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25061400).

20977902 is an abundant number, since it is smaller than the sum of its proper divisors (29144898).

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

20977902 is a wasteful number, since it uses less digits than its factorization.

20977902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 20977902 is about 4580.1639708639. The cubic root of 20977902 is about 275.7956111242.

It can be divided in two parts, 2097 and 7902, that added together give a palindrome (9999).

The spelling of 20977902 in words is "twenty million, nine hundred seventy-seven thousand, nine hundred two".