20770890 has 32 divisors (see below), whose sum is σ = 56972160. Its totient is φ = 4747584.

The previous prime is 20770861. The next prime is 20770903. The reversal of 20770890 is 9807702.

It is a Curzon 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, 49245 + ... + 49664.

It is an arithmetic number, because the mean of its divisors is an integer number (1780380).

Almost surely, 2^20770890 is an apocalyptic number.

20770890 is an abundant number, since it is smaller than the sum of its proper divisors (36201270).

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

20770890 is a wasteful number, since it uses less digits than its factorization.

20770890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98926.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20770890 is about 4557.5091881421. The cubic root of 20770890 is about 274.8854178293.

The spelling of 20770890 in words is "twenty million, seven hundred seventy thousand, eight hundred ninety".