20422661 has 12 divisors (see below), whose sum is σ = 25155468. Its totient is φ = 16474752.

The previous prime is 20422657. The next prime is 20422669. The reversal of 20422661 is 16622402.

It can be written as a sum of positive squares in 2 ways, for example, as 10144225 + 10278436 = 3185^2 + 3206^2 .

It is not a de Polignac number, because 20422661 - 2² = 20422657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11426 + ... + 13091.

It is an arithmetic number, because the mean of its divisors is an integer number (2096289).

Almost surely, 2^20422661 is an apocalyptic number.

It is an amenable number.

20422661 is a deficient number, since it is larger than the sum of its proper divisors (4732807).

20422661 is a wasteful number, since it uses less digits than its factorization.

20422661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24548 (or 24541 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20422661 is about 4519.1438348431. The cubic root of 20422661 is about 273.3405786631.

The spelling of 20422661 in words is "twenty million, four hundred twenty-two thousand, six hundred sixty-one".